I was on it two weeks ago, and we had to wait 30 minutes for an engine to show up**.
Once they boarded us, the LSA made an announcement that they were prepping the diner and would be ready for dinner in about 10-15 minutes. She then made a second announcement that dinner was first-come, first-served. The diner never got full, and they did the same for lunch the next day.
**Despite leaving Chicago 45 minutes late, we arrived in NOL almost an hour early.