There are certain measureables that make a player a "No Doubt" candidate for Power 5 schools.... What gets a little more unclear is what the measureables are that are needed for Mid-Majors, it can depend a bit on conference and individual school.
You can go through rosters and look up players' PBR and/or Perfect Game profiles and see what numbers they put up at showcases in high school. I will caution you to mostly look at freshman & sophomores though because the game is changing that fast. I'm seeing lots of Exit Velos 95+ among players at Mid-Majors who were 2017 or 2016 HS graduates, and also lots of corner infielders who run 7.2 or faster...
Ultimately, having a great experienced travel director who can effectively tell you what schools to target is invaluable. Even better if you can get a second or third opinion.
The mph for pitchers and the 60 time for position players remains the most important criteria.