New Queen Freed
Checking later, we were finally seeing some bees coming and going from that hive. They were very active in the old hive, so much so that I was a bit concerned they were maybe going to swarm even though we had done the split. They settled down later. I imagine they were just very busy out gathering pollen and nectar, after yesterday's heavy rain. They are gathering from the bushes along the edge of our property, which are loaded with blossoms right now.
So, we'll next check in about a week to see if there are worker larva in both hives. If so, we should be all right.