Slowly but surely, details for the hotly anticipated heavyweight title tilt between Deontay Wilder and Tyson Fury are coming into focus.

The Showtime pay-per-view fight will be staged December 1, it was announced Friday, though there’s still no set location. However, sources tell The Ring Wilder Fury will take place at either Mandalay Bay in Las Vegas or Staples Center in Los Angeles. (The Ring previously reported the date for the fight.)

“Just signed my portion of the contract for the Wilder vs. Fury fight, it is officially on,” Wilder, 32, said on his verified Instagram account. “It’s going to be an exciting fight, it’s going to be an explosive fight. It’s going to be a fight for the legacy.

“It’s going to be a pleasure: the two best heavyweights competing against each other. I just beat, in my opinion, one of the best heavyweights in Luis Ortiz, and now I’m going for the next best in the heavyweight division.”

With Wilder (40-0, 39 knockouts) putting his WBC title on the line in a voluntary defense, there’s an immediate rematch clause in place should he lose in an upset, according to sources. The press tour will kick off October 1 in London and continue on with stops in New York and Los Angeles.

Fury (27-0, 19 KOs) remains the lineal champion dating back to his decision win over Wladimir Klitschko in November 2015. The Brit endured a lengthy layoff due to cocaine addiction and depression before returning this summer with a pair of victories over journeyman heavyweights.

“I just signed my end of the contract for the Wilder fight, signed, sealed and delivered,” Fury, 30, said on his official Instagram account. ” … Deontay Wilder, you’re going to get it, mate. You’re in big trouble. I’ve never met a man I couldn’t beat in a boxing ring or outside in the street.

“I know you got a big punch, I know you’re unbeaten, I know you got a big mouth and I know you want to win. But you don’t want it like I do. You can’t beat me. I will out-heart you. I will force my will upon you until you quit. That’s a promise. That chin is going nowhere. That chin will absorb all your power, and I’ll detonate it.”

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Now that the date is squared away, the undercard is beginning to take shape. Junior middleweight champion Jarrett Hurd could return on the televised undercard, per sources.

He hasn’t competed since suffering a torn rotator cuff, but he’s resumed training. Hurd would likely be matched up with a middling opponent before an early 2019 showdown with Jermell Charlo for the vacant Ring 154-pound championship.

Hurd scored the biggest win of his career in April, a victory over Erislandy Lara that required a final-round knockdown to pull out the decision.

Heavyweight contender Luis Ortiz could also continue his comeback on the undercard. The Ring’s No. 4 heavyweight had Wilder in serious trouble during their March fight, but the 39-year-old Cuban was knocked out in Round 10. He returned with a second-round KO of Razvan Cojanu in July, and figures to secure another notable fight soon.

Mike Coppinger is the Senior Writer for RingTV.com. Follow him on Twitter: @MikeCoppinger