If I am reading this correctly, that you are planning or thought of waiting till Thursday to deal with this, why not make up a artificial swarm? Are you waiting for them to swarm to then catch them? If so, perhaps not the best plans.
The old queen usually leaves prior to queen cells emerging. Sometimes bees can keep the virgin queens inside the cells. But I would think that this is just a temporary control measure and multiple queens will emerge, and it will be a battle with you losing queens.
Bees may delay swarming for a day or two with bad weather. So this means instead of leaving three or four days prior to new queens emerging, she may leave 2 or 3 days prior to new queens emerging. They don't wait till the day of the new queens emerging then decide to stick around. That is why some swarms may fly off perhaps a week prior to new queens hatching. And if within the week, it becomes nasty weather, they will hold off and then emerge on the first sunny day. So No, it is not the same as if they are holding out some horrible storm. What you might end up with is one queen, either still in control of the colony but damaged, or a hive with no queen after the only good queen flies away.