For months, it had been considered just as many of his terrific highlights — a slam dunk without question — and on Monday evening, Zion Williamson finally made the obvious official.

The Duke freshman phenom, whose freakish athleticism, scintillating dunks and venerable personality starred the center of the college basketball season, announced on Instagram his decision to enter the NBA draft, becoming the last of the Blue Devils Big Three to publicize his intentions.

“I don’t think I can put it into words how special this year was,” Williamson said, in addition to thanking his family, coach Mike Krzyzewski and the rest of Duke.

And that it was, the 6-foot-7 forward averaging 22.6 points, 8.9 rebounds and 2.1 assists over 33 games that included an ACC Championship and NCAA tournament disappointment, with the Blue Devils bowing out to Michigan State in the Elite 8.

Williamson’s soon-to-be former teammates, RJ Barrett and Cam Reddish had previously declared, though neither is expected to topple Zion — who has already earned first-name status as only a few select star athletes have — as the first to hear Adam Silver call his name on June 20.

Of course many will parade Broadway if it’s a Knicks hat in the commissioner’s hand for that declaration, the franchise already pulling out all the stops for the May 14 lottery by having the last No. 1 pick in team history (1985), Patrick Ewing, in the building for when the ping pong balls fall in May.

“I mean, I don’t know if they need much saving, but … to the New York fans, I really appreciate the love and support. If the Knicks did draft me, I would love to be there,” Williamson said during March Madness. “Like I said, whatever team drafts me, that’s where I want to be.”

There’s a 14 percent chance it all comes to fruition, as the next last-place Knicks waiting game is officially underway.