You don’t need it to be on the appliance itself. Hook a power metering smart outlet and you can tell. Or a shake sensor. Or an open door sensor. Combine them all for a reliable effective way to tell if it’s done and the door has been opened, all for a much lower price than what those “smart” appliances charge the premium for. This way you can also choose vendors that work on local wifi/zigbee/z wave and don’t own a paper weight or part functional item the moment the vendor decides to shutdown the servers.