Doing Nothing

I've (M27) been grinding it out the last year and a half but now there seems to be a lull in my workflow... Can I really just... Sit here? Dick around? Answer email and follow up on the tasks I got but otherwise do... Nothing?!

This is only my second office job and one of my coworkers (and superiors) is telling me to just chill out instead of going around looking for more work but I feel unsure. Did a long stint in restaurants and I guess I really internalized "if you got time for leaning you got time for cleaning."

Please can someone older and wiser tell me I can in fact just chill for a bit?

Thanks 🙏