Yes, just go to the precheck lane. There is no formal invitation sent out or sign-up mechanism. Filling out your Secure Flight Passenger Data profile and clicking the check-box to consent to DL saving it and sharing it with the TSA is all there is to it. Since you've already gotten it before, DL has clearly opted you in already.
Tonight at LGA got my precheck. In the line was A Dad who got precheck and was told to take kids with him but mom could not. End result was a clogged precheck as dad and kids did the usual undressing and liquids and electronics removal. If you get the three beeps you should at least understand the process. Otherwise go through normal screening. Ughhhhh.