Cubs have a 5.5 game lead over Dodgers and 8.5 over Arizona for the last wildcard spot, if I'm tracking the standings correctly, with 16 games left.
Cardinals have a brutal schedule left, with Dodgers, Braves, Brewers, and Cubs left, and only Giants as a lesser opponent.
Dodgers have Cardinals, Rockies, and Arizona left. So fair chance that even if they were to get super-hot and put pressure on the Cubs, they might be pushing the Cardinals or Rockies back in the process.
Holding off the Brewers for the division is one thing; just getting in is another.