Bayern Munich should start with bringing a solid centre-forward first. Until then they will still be lacking an important player in the attacking line. It isn't the kind of a job that they can do with Mane or Choupo-Moting in this position. They tried this last season but failed after that. Even their winning the Bundesliga title was by chance thanks to Dortmund's huge mistake. If they had a centre-forward like Lewandowski they could have had a much more comfortable run in the Bundesliga and they could have been stronger in the Champions League.
They have made a start by making their first offer for Kane though but this was quite below the price Tottenham wanted for him. Kane or someone else they should solve this problem in the summer.
Harry Kane is Bayern Munich choice for a centre-forward position and negotiations may be ongoing. Even though the first offer was rejected by Tottenham, I'm sure Bayern Munich won't just give up on getting Harry Kane. Choupo moting might be eliminated if Bayern Munich gets Harry Kane in this season's transfer window.
Tuchel will continue to monitor a number of potential players that they will bring in to strengthen the team next season. But for now, only Harry Kane is being focused on by Bayern Munich after they managed to get Kim.