The separation between the NFL’s haves and have-nots already is taking shape.

Seven teams will enter Week 4 at 3-0, while six already are 0-3 after the Redskins’ 31-15 loss Monday night to the Bears.

Another unbeaten team, 2-0-1 Detroit, ties for the biggest mover in The Post rankings, advancing eight spots, one notch outside the Top 10.

The other eight-spot jump? That belongs to impressive rookie Daniel Jones and the Giants, who moved up to No. 23, with the Jets assuming Big Blue’s No. 31 position from last week.

1. New England Patriots, 3-0 (Last week: 1): It was nice of Bill Belichick to aid the Jets’ back-door cover by inserting backup quarterback Jarrett Stidham for the late Jamal Adams pick-6. Not so nice? His death stare at CBS sideline reporter Dana Jacobson when she dared to inquire about Antonio Brown’s release before Sunday’s game. The Pats have outscored their opponents 106-17 through three weeks, and their defense hasn’t allowed a TD yet entering this week’s AFC East showdown against unbeaten Buffalo.

2. Kansas City Chiefs, 3-0 (2): Is Patrick Mahomes actually getting better? Scary, but altogether possible. The Chiefs are averaging 392 yards through the air, 81 more than the second-place Pats. Mahomes also has 10 touchdown passes with no picks. He’s already established himself as the early front-runner to repeat as league MVP entering Sunday’s visit to Detroit.

3. Los Angeles Rams, 3-0 (3): Neither Jared Goff nor Todd Gurley has gotten rolling yet, but Aaron Donald and Clay Matthews have fronted the third-ranked defense in the league, behind only New England and rising NFC West foe San Francisco, with a home game against Tampa Bay up next.

4. Dallas Cowboys, 3-0 (5): Dak Prescott and the ’Boys didn’t appear particularly motivated or sharp early on against the putrid Dolphins, leading only 10-6 at the half. But they finished with 235 net rushing yards (more than 100 each for Ezekiel Elliott and Tony Pollard) in a 31-6 win. Dallas should have its first true test this week against New Orleans, even sans Drew Brees.

Aaron Rodgers seems to be taking a less-is-more approach for the unbeaten Pack, throwing for just 647 yards and four scores through the three wins. Green Bay faces a short week ahead of Thursday’s game against the banged-up Eagles at Lambeau.

6. Baltimore Ravens, 2-1 (4): A five-point road loss to the Chiefs notwithstanding, the Ravens still easily look like the best team in a weak AFC North, especially with Cleveland’s odd play calling and uninspiring offensive play in Sunday night’s home loss to the Rams. We’ll know more after Lamar Jackson squares off against Baker Mayfield and Odell Beckham this Sunday in Baltimore.

7. San Francisco 49ers, 3-0 (8): The 49ers were a mess offensively with five turnovers Sunday, but Jimmy Garoppolo still pulled out a 24-20 win over depleted Pittsburgh with a short touchdown pass with 80 seconds remaining. Surprising San Fran will remain unbeaten for another week; they join the Jets with a bye this weekend.

8. New Orleans Saints, 2-1 (11): With Teddy Bridgewater filling in for Brees, Sean Payton leaned heavily on Alvin Kamara, who compiled 161 total yards with two touchdowns in a 33-27 win over Seattle. We’ll see if a similar game plan works again when the Saints face a much better Dallas defense.

9. Seattle Seahawks, 2-1 (6): Ugly loss to the Brees-less Saints, a rare mistake-filled game for Pete Carroll’s team, especially at home. Misleading final score, too, as the Seahawks trailed 33-14 with three minutes remaining before Russell Wilson mounted two late scoring drives.

10. Minnesota Vikings, 2-1 (16) The combination of NFL rushing leader Dalvin Cook (375 yards) and a shutdown defense (47 points allowed) vaults the Vikings into the Top 10, but Kirk Cousins has been underwhelming (37-for-63, 502 yards) through three games.

11. Detroit Lions, 2-0-1 (19)

12. Buffalo Bills, 3-0 (18)

13. Houston Texans, 2-1 (15)

14. Chicago Bears, 2-1 (17)

15. Indianapolis Colts, 2-1 (20)

16. Los Angeles Chargers, 1-2 (10)

17. Cleveland Browns, 1-2 (9)

18. Atlanta Falcons, 1-2 (12)

19. Philadelphia Eagles, 1-2 (13)

20. Tennessee Titans, 1-2 (14)

21. Carolina Panthers, 1-2 (22)

22. Tampa Bay Buccaneers, 1-2 (21)

23. Giants, 1-2 (31): Daniel Jones’ first NFL start in place of Eli Manning couldn’t have been more encouraging, showing off his advertised mobility with two touchdowns runs, including a late 7-yard scamper — to go along with two earlier TD tosses — to complete an impressive second-half comeback. A Swiss-cheese defense in the first half (28 points) tightened up after intermission, holding the Bucs to a field goal. Jones could use more of the same support this week at MetLife against winless Washington without Saquon Barkley (ankle).

24. Oakland Raiders, 1-2 (24)

25. Jacksonville Jaguars, 1-2 (29)

26. Denver Broncos, 0-3 (25)

27. Washington Redskins, 0-3 (26)

28. Arizona Cardinals, 0-2-1 (27)

29. Pittsburgh Steelers, 0-3 (23)

30. Cincinnati Bengals, 0-3 (30)

31. Jets, 0-3 (28): The Jets slide into their bye week and into the second-to-last spot in the rankings previously held by the Giants after a rough 30-14 loss to the Patriots, in which they were outgained in net yards 382-101. Rookie QB Luke Falk threw for just 98 yards and an interception in place of mono-stricken Sam Darnold, and Le’Veon Bell couldn’t bail him out with less than 2 yards per carry (18-35).

32. Miami Dolphins, 0-3 (32)