Do Public Schools Track Employee's Internet Use?

I recently acquired a job with a public school as a custodian I start tomorrow the 13th I'm not planning on using the internet for anything bad but I just don't like the idea of my higher ups looking at my data or seeing me on facebook or sometimes I listen to music while I work when appropriate. I will be using my VPN or phone data at the worst, but if I wasn't to would they be able to see what I'm doing and what.

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Thanks to everyone for your answers. Again I have a VPN and worst case I can use my own data plan sense that's a separate network. I just don't like the idea of the higher ups looking at my personal data. As specialy with how serious schools are with security theese days, the last thing I want is for some stuckup management to take something I searched and turn it into something its not, or mention my internet use to accuse me of slacking off.
Do Public Schools Track Employee's Internet Use?
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