It looks like Napoli are likely to keep many of their talented important players in the team this summer. There is still no offer for Kvaratskhelia and Osimhen as far as I have seen. Kvaratskhelia's market value is much lower than Osimhen but it is still 85 million euros. Not many teams would be keen on signing him both players right away. Especially Osimhen's departure is much less likely because the teams interested have to pay at least 130 million euros for his fee.
Kvaratskhelia's contract is until 2027 so there is no problem about keeping him for a long time. But Osimhen's is ending in 2 years. He might leave for free if Napoli wait for that long. I assume he wouldn't like to end his career at Napoli.
The amount for Osimhen to be paid for a potential transfer is also going up and down in the media. Sometimes it says 180 million and sometimes it says 130 million. I think that Napoli won't be able to sell him for 180 million as that is too much for him. If he scored close to 40 goals in the season in Serie A alone then maybe it could be closer to the 180 million, but for a strong striker with good scoring statistics, 180 million is too much. Kane's numbers in the Premier League are then better because the Premier League is the more difficult competition I would say also for a striker. But Osimhen to stay in Napoli is also not very likely unless they raise his salary and he has no reason to leave.
180 million is indeed too much for Osimhen. Mbappe was signed for that amount by PSG.

Of course the conditions of that time and now aren't the same. Players are getting more expensive in the transfer market now that we see even average level players being signed for really high amount of money. But I still don't think 180 million can be given just like that to any player. Osimhen is a really talented striker undoubtedly. But is he really worth the risk of paying a huge amount?
I don't think he is worth it now. He is still young and he needs to improve continually to prove his worth.