Here's what I found:
Donte Banton is a 4.58 (his HS time at the Miami Opening Regional)
Jaylon Johnson ran a laster-timed 4.47 40-yard dash at The Opening Finals camp
Javelin Guidry ran a 4.35 40 at The Opening Regional in Dallas
That's it. Two (three total, but one ran a 4.58), and all of those were at HS camps, not timed by Utah.