It's true, Hearn has already offered to help Fury back which I guess would include personal training, etc. But, as others have said, I'm not sure Fury has the desire any more. He posts the occasional video telling everyone he's back, calling out rivals, etc, but then he'll turn up at a show and...
In any case, he would have to be at least at the same level he was when he fought Wlad, if not better, to make a fight with AJ or Wilder remotely interesting.
Whilst I'd prefer the winner of Wilder-Whyte to face AJ in the summer, I'd be just as happy - though I know it'll never happen - to see Fury fight Whyte as a 'warm-up', Wilder fight AJ, both fights in the spring, and the winners of each to fight in the summer.