Very normal for a Thursday night. It may end up in the 70's before the flight leaves.
UA has a lot of elites. Everyone makes the list, even Silvers and Golds who have a very low chance of upgrades. Not sure why people continue to be surprised that the upgrade list may contain half or more of any given flight to major airports. It's only noteworthy, IMO, if you're a 1K and and number 40 on that list (as an example).