Teslas own information on their website (which I grabbed a screenshot of above) says that the requirement is 687kWh per powerwall. The batteries supposedly have to be cycled 52 times a year each, not each battery 104 times a year. Any chance you got the number "104 times a year" from when you were looking at 2 powerwalls and into applying for the SGIP yourself?
I obviously dont know what you were told or saw, but requirement should be 52 times a year per battery (13.2 X 52 = 686.4, or pretty much exactly the "687" on teslas website).
I am fairly confident your requirement is 687 X 3, or 2059, and you are already 1876kWh used so have almost met the requirement and will by the end of june for sure.
The large-scale (general market) SGIP is different. Edit: *I'd have to bet that they actually distinguish between large-scale residential and large-scale non-residential. And so far I don't know if they are that precise on this large-scale program since most of the people claiming it are commercial* It used to be 130 cycles, but they reduced it to 104. TBH, I don't think I'd hit the 130 cycles unless I did some grid exporting. There's also a chance I don't get my SGIP money unless I do the 104 cycling (eg, they pay the incentive ratably over 5 years instead of up front.