Brewers currently have 98.6% odds of winning the division per Fangraphs. If they split the next two games that probably would increase to closer to 99%. That's pretty much almost impossible. Fangraphs calculates these odds by running 20,000 simulations based on ROS projections for individual players and playing time.
If Brewers split the next two they would have an 8 game lead with 21 games remaining and a magic number of 14. If the Brewers went 10-11 to finish the year the Cubs would need to go 18-3 to tie the Brewers in the standings. I'd consider those odds almost impossible.