Florian Wirtz seems like secured for Leverkusen for at least next season. Normally it wouldn't be much possible but Xabi Alonso effect changed everything for Leverkusen. They started to believe in themselves to achieve any title available. 
Therefore I also think Wirtz doesn't need to leave already now. He is only 21 years old as well so there is no need to rush while doing wonders with his team.
But in the summer of 2025, it seems like it will be very difficult to keep him. Real Madrid and Barcelona are already monitoring him according to rumours. As long as Leverkusen doesn't win the Champions League title I don't think he would stay.
Florian Wirtz performance is very fantastic this season he is one of the key player from Leverkusen and Florian Wirtz too has help Leverkusen to gets double winner this season and his records in Bundesliga is 11 goals and 11 assists these statistics also makes him as the best player in Bundesliga for season 2023/2024 so i have no wondering if some of big clubs were showing their interest to him but indeed Real Madrid and Barcelona has a plan will attempts to gets him on 2025 but i think it's hard for Barcelona to compete to gets Florian Wirtz because their financial conditions which makes them unable to gets the players with expensive price Therefore I also think Wirtz doesn't need to leave already now. He is only 21 years old as well so there is no need to rush while doing wonders with his team.But in the summer of 2025, it seems like it will be very difficult to keep him. Real Madrid and Barcelona are already monitoring him according to rumours. As long as Leverkusen doesn't win the Champions League title I don't think he would stay.
Leverkusen know next summer it's impossible to hold Florian Wirtz which mean they are realized there is possibility for him to leave so that's why Leverkusen has been release the price tag for Florian Wirtz because although Florian Wirtz hasn't have release clause price into his contract but Leverkusen only want 150 millions to him so that's why i said above because it's hard for Barcelona to compete with Real Madrid to gets him because Florian Wirtz price is very expensive however it says why Real Madrid is really serious want Florian Wirtz because they say Florian Wirtz can be considers as the next Toni Kroos