The Knicks know they will be in their first NBA Finals in 27 years.

Now they’re one Oklahoma City win away from knowing they will face the Thunder.

As the Knicks rest and recuperate, they won’t play until going on the road for Game 1 on June 3. It’s a nine-day layoff, while they watch across the country at the slugfest that is the Western Conference finals.

Top-seeded Oklahoma City held serve at home with a 127-114 victory over the second-seeded Spurs in Game 5, taking a 3-2 series lead and moving a win away from booking a date with the Knicks.

“We just played to who we were tonight,” said Shai Gilgeous-Alexander, who had a game-high 32 points and nine assists. “I might have had the worst start to a basketball game in my career, but the group held it down, kept us in the game. Somehow we still won the first quarter [29-27], but that’s just a testament to the guys in the locker room.

“I’ve been saying it all year, we’re a group of one through 15. We wouldn’t be this deep in the season without the guys, everybody on the team. And it just showed again.”

The series moves back to Game 6 on Thursday night in San Antonio. The Knicks will almost assuredly be hoping for the series to go to a Game 7 slugfest back in Oklahoma City on Saturday, with the two Western foes beating each other up.

The Thunder are already playing without All-Star Jalen Williams — hobbled by a hamstring injury — and guard Ajay Mitchell.

But a Knicks-Oklahoma City matchup — the league’s biggest market against its best team, the defending champions with the two-time reigning MVP — would be mouthwatering.

Gilgeous-Alexander turned in an MVP-worthy effort to lift OKC within a game of going back to the Finals. Yes, he had six turnovers and shot just 7-for-19 from the floor against a long, athletic Spurs defense. But he worked his way to the free-throw line at will, going 16-for-17 from the charity stripe.

Even playing without All-Star Williams and Mitchell, the Thunder held San Antonio to just 40.2 percent shooting and 12-for-41 from deep. Alex Caruso had 22 points, Jared McCain — acquired from Philadelphia for a first-round pick and three seconds — added 20, including 18 after halftime.

It was a huge bounce back for the Thunder. After being smothered 103-82 two nights earlier in San Antonio, they erupted for 40 points in the second quarter to seize a commanding lead they never surrendered.

“We made adjustments after the last game,” Gilgeous-Alexander said in a postgame on-court TV interview. “I think we just applied what we learned. And that’s what a series is about. Against a really good team, you’ve got to try to get better after each and every game, and we definitely got better from last game.”

This time Oklahoma City built a wall to stop Victor Wembanyama. The towering Spurs superstar came into the night averaging 30.3 points and 13.3 rebounds in this series, but was held to 20 points and six boards — a second straight single-digit night on the glass. Isaiah Hartenstein and Chet Holmgren held him to just 4-for-15 shooting and seemed to have him on the back foot for much of the night.

Wembanyama, who would provide a unique challenge for Karl-Anthony Towns should the Spurs meet the Knicks in the Finals, will need to dominate Thursday to force a Game 7.

But if the Thunder close out the series, expect to see Mikal Bridges get the first crack at guarding — or at least slowing — Gilgeous-Alexander. The latter pointed to the Thunder’s process for Tuesday’s win, and what they will need for Game 6.

“Yeah, it’s all that ever matters,” Gilgeous-Alexander said. “Nothing else you can control. You can’t control the outcomes, the shots going in or out. All you control is the process and the preparation, and that’s what we’re about.”

Whichever team the Knicks end up playing will provide an entirely different class of opponent and far tougher test than they faced in the Eastern Conference.

Despite the Knicks reeling off 11 consecutive wins — including sweeps of the 76ers and Cavaliers — the Thunder and Spurs are on another level.