Besides the LV site, and the #1 highway Canadian Prairies sites, and the original Fremont location, what are the other confirmed V3 locations?
2 days after your post, supercharge.info listed the permitted Vienna, VA (Wash. DC metro area) as 250kWHawthorne (Tesla design studio + SpaceX HQ) has some V3 stalls. Other that that and the ones you mentioned, the only one I'm aware of is Supercharger - Santa Rosa, CA (V3, under construction, Jul 2019, 20 stalls).
Supercharger - Vienna, VA