I was in a pretty bad shape 1 month before my surgery. My weight had dropped from 46kgs from 54kgs. Though I've been working out till a week before my surgery. Got the jpouch in 2 steps, I had to wait upto 8-9 weeks , my colon was removed and the pouch created simultaneously and then takedown. My surgeon said 6 weeks was good enough for the pouch to heal but I waited just to be sure. Anyways if he had said 3 months I'd have taken 4 . So whatever time your surgeon recommended stick to it , they know whats best.
Good luck 👍