I believe this issue will be resolved soon because if Napoli don't sell him this year, they will be forced to watch him leave the club for free next year. Furthermore, they could use the proceeds from this transfer to make numerous other signings.
I don't expect much from the current Napoli management and if they are not limited by his contract expiration next season, I will say I am pretty sure Osimhen will stay out of the field the whole season.
Experience showed how hard to deal with Napoli exaggerated demands.
Right now, Napoli owner try its last chances to push Galatasaray to the limit because they know they want the player and Osimhen wants to be in Istanbul. Otherwise they would be more than happy to sell him right away to Al-Hilal because Saudis pay better.
We will continue to see this saga until the last day of the transfer window apparently..