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I am quite sure that Bayern Munich will win their postponed match against Union Berlin so that they will take over the position of leader of the standings, but the postponed match has not been rescheduled when it will be held, so Bayer Leverkusen will still be in first position, but there is a second opportunity for Bayern Munich to shift Bayer's position because their competitors will again face a quite difficult match next week against Stuttgart.
Bayer Leverkusen in the match against Stuttgart may not yet experience defeat but if the result is a draw it will again give an advantage to Bayern Munich, so Xabi Alonso has to be aware of this and sometimes it is a sign of decline because his team cannot recover quickly to widen their point lead again with Bayern Munich.
I'm also sure Bayern Munich can win, because Union Berlin probably won't be able to stop Bayern Munich from getting the three points, Union Berlin performance is also not very good this season.
Yes, second opportunity for Bayern Munich this week, when Leverkusen plays against Stuttgart. In that match, Stuttgart will also be playing at home, they are quite great there. If I'm not mistake they also only lost one at home so far, when against Hoffenheim. In the next match, I hope that Xabi can improve his tactics, so that the same result (draw) doesn't happen again in that match, maybe making the first score will be more comfortable for them.