Can I Overwinter the Pot As Is?
Maybe. If you don't want to use the flower pot for a holiday arrangement for the porch you can try to just keep everything together in the pot and see what, if anything, survives the winter. You would bring the pot into an unheated garage and let it live out the winter there for the best chance of survival, but honestly it's not super easy (or beginner-friendly) to overwinter mums in pots, let alone the other plants. Mums overwinter nicely in the ground, but a hard freeze can quickly kill their roots in a pot because they don't have as much soil to surround and insulate them. So basically, I don't advise it, but it doesn't hurt to prove me wrong.