There aren’t any V4 Superchargers in the wild. You would have heard about it, if they had been released. All Superchargers in the U.S. are still V2 150 kW, Urban 72 kW or 250 kW V3 stations.
Don’t be confused by anyone claiming a 250 kW Supercharger with taller posts and longer cables are V4. They are still V3, just with different charging posts. At best, they are V3.5.