First post for me! Long time follower, never posted before.

I have an economy ticket from DUB to LHR on BA in a few weeks. However I'm OneWorld emerald. I believe the emerald level means I can use the priority/first class BA check-in counter for our bags and the fast track security. Is that right? Panicked about the possible wait times although we don't fly until late morning so it sounds like the early morning rush may be done by that time.