Check in question VS012 BOS-LHR

Hi all, I'm flying back from the US BOS-LHR in June on VS012. My schedule will put me back into Logan airport around 4pm. I am aware that the flight doesn't depart until 9.50pm & check in opens around 6pm. As I will only have carry on bags, can anyone tell me if I can check in on line & then proceed through security & into the lounge around 4.30pm?

I think you may have to hang around for a little while.
Been in there at 5:30pm before and it looked like they had not been open that long.
They do support flights for a few other airlines there as well but I think they all now depart are around the same time.