Weight is your friend. Mechanics is your savior. Weight and proper mechanics will set the stage for when Velo comes. My RHP son, 6'3", didn't break 90 until Aug of Soph Summer. 90-91 at Underclass WWBA and then 92 at Jupiter at 182 lbs as Junior. Put on 24 lbs during Covid Quarantine/HS Season. Huge difference in physique. Now sits 90. still weighs 204. Big difference.
The real interest/recruiting didn't start until he broke 90. Didn't learn a curve until Junior year (keys before curves). He had Fastball, Cutter, somewhat of a change. Now has 2 & 4 Seam, Curve, Cutter, Change and sick command of 5 and can use them as needed. Huge difference.
One thing to also consider is these guys lost a "season" so history & timing does not apply.
Including HS season and summer/fall he's at 57 IP. He'd get that in a Normal HS season with Districts and finish the summer around 100 IP. So it's hard to judge timeframe and ramp up like we have in the past. He's basically in "May" shape and would be getting ready for summer/travel ball.
To be honest, we were happy HS season didn't happen and that saved 1000 pitches off his arm, but not throwing disrupted his gains and delayed this summer/fall ramp up and preparedness. Luckily we stuck with the same consistence and Pitching coach and he got used to the additional weight and how to use it.
Naked Mass protein shakes have been quite helpful. Eat more, work out, drink shakes and drink again before bed. Calories and good cardio. You'll see gains on the mound.