He's gassed and will need to be shut down soon. He's faced 545 batters, near his all-time high of 582, and his arm is worn out with all those high pitch innings. In his eight starts since July 1 he's averaged 20.9 pitches per inning, and his ERA has risen from 3.60 to 4.50. He's also averaged just 4.4 innings per start since then, so he's making the bullpen work harder. For the season his average of 18.9 P/IP is more than 1 higher than the 2nd highest starter across MLB.
If this team were making a playoff run it would be a big issue.