For the fact that the match between Bayern Munich and Schalke will be taking place in the home of Bayern Munich, I don't think Schalke will succed in winning the game against Bayern Munich. This a chance for Bayern Munich to make full point out from this game to make sure they win Bundesliga league.
on paper Bayern munich has everything to win this match because they will be playing at home and their are targeting victory in order to strengthen their ranking from the pressure of dortmund in second place. Apart from that, the statistics for the meeting between the two were also dominated by Bayern Munich's victory, so there is no doubt that they will be able to win the match against Schalke.
But from here I see the remaining matches this season which leaves 3 more matches, of course Bayern will work hard enough to be able to win all the remaining matches. schalke is also in quite an impressive state in the last two matches, they worked quite well in the previous two matches which can be a big capital for them when they face bayern munich.