So here is the dilemma. You want to let the roots dry out a bit and get some air. However you will also need to water when you transplant. Your plants are under a lot of stress from sitting in too moist a soil and from the recent topping. By the way I don't rememner if you said are these autoflowers? Autoflowers are more sensitive to stress. Anyway what you need to try to do is let the soil get dry and see how the plants look. If they are looking stronger then you can try transplanting. For the mix you are transplanting into, you want the soil lightly moist. When you mix it with the perlite I would use a spray bottle and keep misting the soil as you mix it. You want it all sort of damp but not wet. Then transplant and lightly water the plant into the new container. If your new container is bigger remember the soil will hold more moisture so do not soak the new container. Even with the perlite you don't want the plant sitting in super wet soil right now. If you don't think the plant looks strong enough then wait another watering, but water lightly until she recovers.
