That's right, Bayern Munich will try to prevent the points gap from widening with Leverkusen, besides they will also try to maintain their prestige as rulers of the Bundesliga. Even though he is no longer in the race for trophies at the moment, Tuchel will try not to increase his team number of defeats, so that it will have a bad effect on their status in the Champions League later. In the first half of the season, Dortmund lost at home, so it was not an easy job to get points at the Allianz Arena.
I think Dortmund is also very aware of that now even though Dortmund will also try to get points at the Allianz Arena this weekend. However, because of what you said, it also makes sense that Bayern Munich itself will also try not to lose any more matches with any team in the Bundesliga in order to keep the points gap the same as now. Or at least be able to cut it a little when Leverkusen suffers a draw through their own matches in the remainder of this season in the Bundesliga.