The position of Group A standings is now led by Munchen with complete wins, and I think it will remain like that until the group phase matches end. This means that Munchen has a big chance of winning Group A, while the runner-up still has a chance of being contested by three other teams, Galatasaray, Copenhagen and United.
Given the current situation, I believe Bayern Munich and Galatasaray will be the next two teams, provided Galatasaray manages to have a good result against Bayern Munich in the third match.
If Galatasaray are to win this match, then they will need to capitalize on the weaknesses in Bayern Munich's body of work. Yes their defense has been the highlight of their few matches, and that should be exploited by Galatasaray by creating quick goals. But whether Bayern Munich can apply a better defense or not in this match? That is the problem, if Bayern Munich can be better in defense obviously it will be a 2 times more difficult task for Galatasaray. Actually, they don't need to target victory, especially with a very strong opponent, a draw is a good result for them.
I also expect Galatasaray to aim for a draw when facing Bayern Munich. This is especially likely since they are playing at home, making it easier to adopt a tight defensive style and wait for opportunities to exploit Bayern Munich's weaknesses. Galatasaray is known for executing this playstyle effectively.