Now should be just fine in your area. Now is definitely better than trying to store them though winter some other way (sounds like you already bought them)! Besides that, if you got them from Lowes, they should have a one year warranty, so if they don't make it though winter, buy more in spring.

I personally probably wouldn't buy fruit trees from Lowes for a number of reasons (often poor condition of their trees, chance of being misidentified, often not being able to even know what rootstock was used, etc). But, that's not what you asked...

Below is a link to my guide for planting woody plants. I think it should answer most of your questions. If not, please ask!

Here is a link that might be useful: Planting a Tree or Shrub

I'm not aware of a "dwarfing" rootstock for peach's
I've heard of: Citation, Bailey seedling & Lovell peach for the North American Eastern part of the content that has colder winters.

There are some genetic dwarfs, and some new dwarfing rootstocks for peaches. I don't know how extensively they've been tested. Citation dwarfs some, but I don't like it. I've read others have had problems w/ it too.

That said, just because Lowes labeled the trees dwarfs, doesn't mean it's so.

They will survive better in the ground than in pots, unless you intend to over-winter them inside a garage, or building that will be warmer than outside.

If you get strong winds, I suggest that you stake the trees because they won't have much root to hang on with.

I overwintered 2 t-budded G11 apple root stocks last winter, lowest temps were 0. The trick, buried the (3 gal) pots completely under chipped tree mulch leaving a mound about 5' in diameter. don't forget to ensure that the pots aren't dry before mulching and check them throughout the winter for dessication, water if dry. Mine made it through the winter without needing any watering.

Don't know if a peach would do as well but, as long as the root ball is protected from rapid temp swings and extremes (relative to those in the ground) I guess it would do fine.

bought a dwarf Burbank July Elberta peach x Stark's catalog last year but haven't tasted any fruit yet but I see dwarf peach trees advertized in several catalogs.