Play time

Hey guys!
I got a chinchilla about a week ago and had question about when I let him out. I have been leaving his cage open so he can just come and go as he pleases when I get home from work until I go to bed. Is that a good idea? Should I not give him access to his cage? He’s started to go in there and go to sleep when he’s tired and done for the night so I assumed it was okay but figured I’d ask.

thanks