yes, that gravity is a bit high for your particular beer. the LHBS was probably just giving you a rule of thumb. You can't always brew by rule of thumb. Not all beer is going to ferment exactly the same and at the same rate, so you shouldn't use a rule of thumb. Before you do anything with your beer, you need to take gravity readings. If you reach your target gravity, you can transfer (if u prefer using a secondary). But in your case, you should have read 1020, then put the airlock back on and waited a couple of days, then took another reading