He looks 230 at most right now. Even at 7'3He's probably at 240 right now and his body will fill out naturally over time even without trying to put weight on. And he doesn't need to be that big anyway in modern NBA. Enes Kanter is bullying today's centers.
And if Knicks provided him with a proper trainer instead that juice head we saw on his IG we wouldn't even have to talk about this.