What is it supposed to be? I'd try for 1.008 to 1.012 if you don't know. Letting it sit 3 weeks will make transferring cleaner and easier. So you make the call. If bottling, let it carb up 3 weeks before lagering. Taste one to verify it is at the carbonation you want and then let it sit in the fridge a month or more after it is carbed up. Or 2ndary lager if you prefer.