The Dortmund team will be the champions of this season only if they win the last match. In the last 10 seasons, we have seen Bayern Munich win the title. And Bayern Munich's performances this season have been erratic. And so Dortmund are now at the top of the table. However, if they want to win the title, the Dortmund team must win the last match. I don't think Dortmund will win easily against the Mainz team, the Mainz team is strong enough. Dortmund can't win against Mainz if they don't play well.
Dortmund's last match was at home and it was the decisive match for Dortmund to become the Bundesliga champions this season. Even though it's not easy, I'm sure that Dortmund also won't want to be humiliated by Mainz at home because they failed to win this season. Dortmund are very aware of this, of course they will never ignore the opportunity to be the best this season so that no matter how hard it is for Dortmund, they will still try to win for the title this season.