Found a friendly gray tabby cat with a green collar wandering in a backyard on the east side of Wausau.

I found a very friendly gray tabby cat wandering in my backyard on the east side of Wausau. He has a green collar with no tags, is well-groomed, and seems to be well taken care of. I've been feeding him since I found him two days ago, but I want to get him back to his owner if possible.