I think Arsenal and Bayern Munich are in the same situation right now despite the position of Arsenal in the EPL, Arsenal is fighting to stay ahead of Manchester City and Liverpool so they can win the league while they are also hoping to get ahead of Bayern Munich to be in the semi while Bayern Munich on the other hand is fighting to see if they can close the gap between them and league leaders Bayer Leverkusen which is currently ahead of them with 10 points, it may appear that all hope is lost for Bayern Munich in the league but they can't give up now until the season is over who knows if Leverkusen will lose 4 matches in the last remaining games and Bayern Munich will catch up with them so they are in similar situations with Arsenal.
All Bayern can hope to do in the Bundesliga is to close the distance to Bayer Leverkusen a little, but I'm pretty sure that they don't have a goal to get ahead of Bayer Leverkusen because that goal seems unrealistic. Now all of Tuchel’s attention will be focused on the Champions League, this is the number one tournament for Bayern now, if they manage to win the Champions League, then for Tuchel this will be the best thing, since he will be able to leave the team with a victory, and in this case there will definitely be many teams, who want to see him on their team. Of course this would be great for Tuchel, but for this I need to do a lot of work, and first beat Arsenal.
I think if Tuchel manages to win the Champions League title with Bayern Munich, it is likely that the club owner or director will try to keep him. I know that sometimes the coach's decision to leave is absolute, but as long as the request is to stay, he may not leave. Actually, that would be good for Tuchel because he could at the same time prove his capacity as one of the most experienced coaches in Europe and being on a big stage like the Champions League is something he and his team must try to conquer.
On the other hand, Arsenal cannot be taken lightly, especially as this young squad is very enthusiastic about producing the first title in the club's history and maybe if Arsenal can get rid of Bayern Munich then they will advance to the semifinals. But unfortunately even if Arsenal qualify then they will face one of the strong candidates for champions between Manchester City or Real Madrid considering they are in the same chart.