If I want to check on the status of a Supercharger Station I drag the map in the car to look at the area of interest and display the charge stations. I can then touch the icon for the station of interest to see the status details.
Each of our cars has the ability to look up any open Supercharger Station in the country. Trip planners are not necessarily up to date. Nav in the car usually is, unless the station was activated in the last day or two IME.