Exactly, Bayern Munich has a big challenge this season that cannot be underestimated. Leverkusen and Dortmund, at least those two clubs will be their tough competitors.
Especially if we look at the last match Bayern Munich vs Wolfsburg, even though they won, their game was not effective and accurate enough.
Check these statistics:

Google/bundesliga-wolfsburg-vs-bayern-munich
They have 71% ball possession, but only 8 shots on target, and only 2 goals created + 1 OG
Analysing the statistics from the game Bayern Munich outclassed Wolfsburg. They had total control of the game and produced several chances but the biggest obstacle was masked goalkeeper Kamil Grabara. The Polish player made six saves denying Serge Gnabry, Harry Kane and Joshua Kimmich from scoring. Wolfsburg didn't show much class but they were good in stealing possession and using the counterattack.
It was a good start for Vincent Kompany's side and the Belgian showed some level of tactical prowess. He was able to know when the match needed experienced players like Thomas Müller. The German came in with a written tactical instruction written by the coach which he passed to his teammates. The substitute turned out to be a good one because the attack became more active and Muller also provided the assist that produced the winning goal by Serge Gnabry.