Man this just never ends.
Jinbe is a Straw hat now, he ain't gonna die for pete's sake. I've never seen the amount of desire for a death upon a straw hat more than Jinbe. Its ridiculous.
There is no point in speculating a jinbe death either. Oda spent so much time and build up for jinbe, ever since impel down when jinbe and Luffy first met. Jinbe has been the straw hat that has constantly been here and away before officially joining, met and left during the paramount war, met and left on fishman island, and met and left again on WCI. Jinbe is joining Wano and that's set in stone, there is no way Oda is gonna keep dragging this shit out, Jinbe becoming a straw hat is way overdue.
If Jinbe is dying in Wano after all this time and cock teasing then Oda's writing has really dropped the ball. Luffy would also be a failure of a captain and he should just give up on becoming the pirate king and finding one piece and just pack his bags and go home.
Luffy postponing the celebration was just the sensible and appropriate thing to do before a big battle against the yonko, Luffy knows it will be a tough challenge to overcome and celebrating too early could really ruin their focus.
There are also theories that someone else would also be joining after Wano, so the celebration would be held at the end with everyone together, just like how they did it with franky and robin back in the Water Seven arc.
If Oda wanted Jinbe to die and have an impactful death, then he would have done it back on WCI, no pointing in letting jinbe still survive to the Wano arc. Jinbe also won't be dying in the Wano arc either, Oda won't pull the same stunt twice, especially when he just used it in the last arc. The Wano arc is also a big arc and has too many characters, Jinbe's death wouldn't even be impactful enough.
So you can forget it and just rest about Jinbe dying already. So many hungry readers on this forum who want their whale shark fish and chips.