2020Dad,
Just so you know... There are first round picks every year that we have recorded below 90mph exit velocity. Two of our top 5 ranked position players have recorded below 90 max exit velocity.
We tend to get a higher level player at our events. The average exit velocity we have recorded for the 2017 class is right between 80-81 mph.
Only bringing this up because it appears your son is already way above average. In fact, the average for 2020 class is 75 mph. Obviously baseball scholarships and draft positions are determined by much more than bat speed and exit velocities. But anywhere around 90 mph is good enough for just about anything to happen, depending on what else is there.