I left the Ed about 6:45 Eastern, and haven't seen the show yet, so I might have more to say later in the week.
Most of what Dave describes below reflects my experience, though the process is much more efficient than in 2017. I arrived at 3:30, and once my plus one satisfied all the COVID requirements, we were in the Ed within 20 minutes and right to our seats (ground level, near the back and across from Joe Saylor in the band, though we still had a fair amount of time waiting in the theater.
The staff had music piped in (mostly current hits). I can't remember who came first, but the floor director and the warm-up guy (Paul Mercurio, who was probably doing it in 2017) were next. Mercurio was leaning hard on the cheerleading approach to being a warm-up comic, which can easily rub someone the wrong way. His interactions with audience members were more entertaining.
The band came out and the crowd really responded. They played the song that used to play over the end titles (chorus lyrics "I feel good, I feel free, I feel fine just being me.") Stephen came out during the song, did the Q&A thing, and then the show started around 5:30-5:40.
Due to scheduling with a guest, we did not see one of tonight's interviews, which was previously recorded. Instead, after tonight's ending was shot, the crew set up for a musical performance that will air at some future point. There was a technical glitch, so they redid the performance, and that was the only reshoot. No promos for the show were recorded either.
Best,
David