At https://my.avast.com/#devices you are able to see the IP address it’s connecting to the internet with. This only allows you to see in which city/region someone is, unless the thief is smart enough to use proxies.
If an IP belongs to someone specific the police might be able to force the ISP to give out address info. Some ISPs use (semi-) statics IPs, but even without this they should be able to provide account details if the police provides timestamped IP info.
Anyway: go report the theft at your local police department if you haven’t already.