Your company's wi fi knows your phone is online, but not where. They have no access to your phone so can't see where your phone is "going". Being connected to the Internet is just being connected; if you worry about where you go, that would be a function of the location you go to, not where you start from/what tool you use to access. It goes "backwards", not forwards. This site owner does not give out any information though so if someone didn't like what you wrote here or thought it was "you" and wanted to know about who you were, they could not get it from here.

Your cell phone can be tracked; but not by your work unless it is a work-owned phone.