Bayern Munich are already the underdog against Real Madrid in the matchup. They must be in their best condition for this tough challenge. 
I'm curious about another thing by the way. Let's say Tuchel managed to win the Champions League title unexpectedly. Then do you think the board would change their mind about parting their ways with him? 
If you think that Real Madrid will easily win Bayern Munic, then I will disagree with you because the Champions league is the only trophy the German Big boys is hoping to lift this season. Having lost the German Bundesliga to Bayern Leverkusen and also out of the German cup which is like also going to Bayern Leverkusen, Bayern Munic will fight tooth and nail to win the champions league, all though I am not saying they will win. Even Real Madrid knows the task ahead and will be preparing accordingly. If you notice, Bayern Munic have systematically improved, winning their matches and scoring more goals. All that are in preparation of the champions league match against Real Madrid. I'm curious about another thing by the way. Let's say Tuchel managed to win the Champions League title unexpectedly. Then do you think the board would change their mind about parting their ways with him? Currently, Bayern Munich is not in good shape, and I believe that is clear to everyone. Bayern Munich has not really gotten their form back. Looking at Real Madrid's form, they are really in great form. So, if I should compare the Real Madrid with Bayern Munich performances statistics, Real Madrid is far better than Bayern Munich currently. So, with that, I did not see Bayern Munich as a tough opponent for Real Madrid.
Even as Bayern Munich has no other competition to focus on again, that doesn't guarantee a win in this ongoing Champions League. Watching Bayern Munich's game against Arsenal, I fully discovered that Bayern is just playing with luck. If not for Bayern, Bayern Munich is not supposed to qualify for this semi-final. If not both home and away, Arsenal really performed better than them."