Sometimes, plants are severely root bound in nursery pots, so my usual advice is to make sure NOT to let the soil dry out. In your case, however, I'd say make sure that the pots are not sitting in puddles of water -- keep them where the water will drain away -- and they should be fine until you're ready to plant.
I wouldn't plant shrubs and perennials in larger pots than 1quart/6"d when the soil is soggy as digging around in that kind of soil destroys the airspace between soil particles. I do sometimes plant plants in 4" pots or smaller in previously prepared beds in
as long as I have loose friable soil to put around the root ball and re-fill the hole.