As I remember, both Superchargers in Sunnyvale and Fremont hub are meant to be open in the end of 2017 according to Tesla website last year. Right now the Sunnyvale one has opened recently, but Fremont Hub is still not. Really hope it can open soon.
Have patience. Many of us generally view those dates as aspirational. There are often factors in a Supercharger deployment that are outside Tesla's control (in particular, inspections and utility hookup).
Bruce.