The Jets remain engaged in a contract standoff with first-round draft pick Quinnen Williams, who as a result may miss the beginning of training camp.

The sides, according to sources, are haggling over the schedule for payment of Williams’ signing bonus, which is about $21.7 million. Williams would like to receive all of that by the end of this year. The Jets are trying to defer some of it into 2020.

The Jets are asking Williams to take a higher percentage of deferred money than any of their first-round picks from the past nine years and a higher percentage than all but one player who was selected in the top 10 this year and already has signed.

The Jets selected Williams with the third overall pick in April’s draft. The defensive tackle out of Alabama is expected to be a major contributor as a rookie. But Williams did not show up last Friday when the Jets’ other rookies reported and he won’t be in Florham Park on Wednesday when the veterans report for camp.

There is still time for the sides to strike a deal Wednesday and get Williams to New Jersey for Thursday’s first practice, but on Tuesday there was pessimism about that occurring.

The Jets went through a similar issue last year with top pick Sam Darnold. He missed the first three days of training camp as his agent worked out a deal with the Jets. The sticking point in that deal was language over voiding his contract.

Since the new collective bargaining agreement in 2011, the money for draft picks is slotted, so there is no negotiating to be done over salary. Haggling is just about contract issues. When Williams does sign, his contract will be for four years and $32.6 million with a fifth-year club option.

The Jets’ stance on deferring the bonus money seems odd. They paid Darnold’s full signing bonus of $20.1 million within 15 days of his signing last year. It seems fair for Williams to be looking for the same thing since he was taken in the same draft position by the same team. Even if you were to say Darnold is an exception because he is a quarterback, it is reasonable for Williams to seek the money by the end of the year.

The Jets have deferred signing bonus payments before for first-round picks, such as Jamal Adams, Darron Lee and Leonard Williams, but not at as high a percentage as they are asking to defer with Quinnen Williams.

The deferment has tax implications for Williams, who will be an Alabama resident until the end of the year and then become a New Jersey resident and have to pay higher taxes on the money. It would cost him about $100,000.

The Jets made their initial offer to Williams before Joe Douglas was hired as general manager last month, but they have not moved off the offer even with Douglas in charge.

And they are running out of time to get a deal done.

The Jets waived RB De’Angelo Henderson on Tuesday.