As I write the Astros are all but a total lock for the playoffs in 2020. The Astros have to lose all three of their remaining games, and the Angels have to win all three of their remaining games, for the Astros to fail to make the playoffs. Zack Greinke, probable Hall of Famer, will surely be the #1 guy in the Astros playoff rotation.
Overall he’s having a good season. In 12 starts his ERA is a slightly better than league average at 4.03. But according to Fangraphs his peripheral stats predict some improvement. His xFIP comes in at 3.