If Barca decides to cash in on Lewandowski, no club is going to pay a huge amount of money because of his age, except clubs from Saudi Arabia. Although, I don't think this is going to happen this summer because Barca appreciates his contribution to the team and wants to keep him. Since he moved to Barca, he has not decline in form. He has consistently been finishing the season as their top scorer, and last season, he scored 42 goals in all competitions. That's insane from a 37 years old.
I have not seen any news that Barcelona wants to sell Lewandowski. But if Barcelona management wants it, then now is the right time to sell Lewandowski. Any big club in Saudi Arabia will be interested in adding a talented and experienced player like Lewa to the squad. And they are ready to pay a big amount.
But if Barcelona does not want to sell Lewandowski, then Barcelona will definitely have to extend the contract with Lewandowski. Maybe Barcelona will not get a big amount of money by selling Lewanodwski. But even if they get less money, Barcelona will still benefit financially. But if Lewa is a free transfer, it will be a financial loss for Barcelona.
Capology
Barcelona pays Lewandowski very high wages. And it is more than double that of Yamal and Raphinha. If Lewandowski is kept in the squad and Lewa cannot play well, then this money will be wasted