Leverkusen is currently only 2 points behind Bayern Munich. So if the Bayern Munich team can beat Leverkusen then Munich can occupy the top spot in the table. But I don't think Leverkusen will lose this match. Leverkusen are in very good form right now. And the important thing is that the match is Leverkusen's home match.
Leverkusen's players are able to score a lot of goals, as well as the team's defense is very strong. This team conceded only 14 goals in 20 matches. So it is a tough task for Munich to get 3 points against Leverkusen in an away match.
Both teams have the same chance of winning. But I think Munich has a slightly better chance of winning than Leverkusen. Both teams are in good form. I can't choose who will win that game. But I think a draw would be fair enough for both teams. It's hard to think Leverkusen will lose because even though Munich are superior in terms of overall team quality, Leverkusen's collective play is very good and they also have a pretty good defense.
In the first meeting, Leverkusen managed to hold Bayern Munich to a draw when Bayern Mnuich played at their own headquarters, now it's Leverkusen's turn to host Bayern Munich. Is this an advantage for Leverkusen? obviously this will be an advantage for them because they will play at home. However, the role of the supporters will be very influential to increase motivation for Leverkusen, they must utilize it as well as possible to get maximum results.
True, if Bayern Munich win then they will take over the top position of the standings, and vice versa if Leverkusen win then they will be able to be a little more comfortable at the top of the standings. But I also agree a draw might be a fair result for both clubs.