Is there a HP written on the control box? I think with the amps and the HP on a well running pump, a knowledgeable pump/wellman would be able to estimate the GPM rating.
One way to calculate the GPM is if the draincock at the tank is large enough, draw off water at such a rate that the pressure holds steady, neither rising nor falling. Then time how long it takes to fill a 5 gallon bucket and do the math.
I see in the report, the static water level is or at least was at the time 150 feet. The pump is set 20 feet off the bottom at 260 feet giving you 110 feet of reserve. Looks like they rated the well recovery at 10 GPM.
Have you given thought to putting a pressure gauge at the wellhead where the PRV is?