evicted tenant moved out before sheriff comes

I have a house which is taken care by a property management company, the tenant didn't pay last month, and the PM company already got the Writ of Possession from court last Tuesday, but the sheriff will not come till next Monday. Today I called the electicity and water service company and was told the service are disconnected today, so it seems that this tenant has been moved out. Can I go ahead to change lock by myself or I need to wait till Sheriff comes? Anything that needs to be pay attention? Thanks!