I would think that the Brewers have a tentative plan for starts for Mis and Harrison between now and the All Star break. That might include trying to get him starts in series against the Cubs, Cardinals, and Pirates.
I wonder if they will set him up to be available to pitch in the ASG. To do that, he could only pitch once in the 8 games against the Cards and Pirates unless they were willing to start him on only 4 days rest.
One way to look at this. If he pitches every fifth day between now and the ASG, he would get 6 starts with the last one being on the Sunday before the break. I would be shocked if they try to do this. So, he will likely get 5 starts before the break, usually with at least 5 days rest in between.
Working backward, he could pitch the first game of the 5 game Cardinal series and then the Saturday game against the Pirates, which would allow him to pitch one inning in the ASG with 2 days rest before and 4 or 5 days of rest after, He could have 3 other starts before that Cardinal series.