I know TOR protects you externally, but could local admins see my browsing history if I am using TOR?
If you want to be safe just use a SSH tunnel to your house then use tor from there. Nothing stops them from using screen cap type software though. I always like to use a work computer with the assumption that someone is looking over my shoulder at all times.
A little bit of web surfing here and there but nothing out of the ordinary, and no questionable sites.