If you go by Baseball-Reference’s Postseason odds, the Astros have a 98.6% chance to win the AL West this year. This figure is actually a lowball assumption, compared to the methods used by 538 (>99%), Baseball Prospectus (99.7%), Fangraphs (99.9%), and MLB.com (100%); those are just the types of odds you get when you have a ten game lead on your division in the last third of the year.
So let’s set our sights a little higher: for instance, what are the chances the Astros finish with the best record in the Majors and secure home field advantage throughout the playoffs?