Yep, make one round, show them where the tea, coffee etc is and let them get on with it. Biscuits etc on the side too.
Not sure I'd go as far as to make a cake, but I might buy one for them. I did take out tea and biscuits to the guys fixing our road's electricity at 2am when we had a power cut. Their generator was keeping me awake but I was just grateful we would have leccy the next day.
It's just manners. I'm surprised you need to ask, OP.