I could be wrong, and no information has been divulged, but I would imagine some percentage of the first years contract will be paid up front as a retainer which would help Savi in being able to obtain material, pay electricity, make payroll, produce Dynovalves, etc. I'm sure that Savi won't be producing 50,000 valves, shipping them and hoping to get paid.
I wouldn't be surprised if the first check is already in hand or deposited. We'd have no way of knowing.