You can if you want, but it's probably not necessary, since caterpillars will wander off of the host plant to pupate, and can be found on a variety of surfaces, natural and otherwise. If you're worried a wandering caterpillar or pupa will be stepped-on, or if an emerging adult will be trapped by a screened-in area, then it might be best to move them into the yard when they're ready to leave the Spicebush. Bear in mind that some might get eaten by predators, parasitized, fall victim to infections, or disappear for other reasons, so by the time they'd be old enough to warrant moving the potted plants, the plant might appear to be devoid of caterpillars, which is normal.

Miri