After 3 days, I did a brood check. As this photo reveals, emergency queens are started.
cheers
PS. I had 4 other colonies to check for new queen. 3 were queen-rite, one wasn’t. I stuck a frame with BIAS into that colony, to be checked in 3 days. They were trying to make queens from unfertilized eggs. Seeing as they were doing that, they should be keen to make a queen with fertilized eggs.