sounds about right to me

might add corn

I'd leave the beets, cabbage and chard. They should be able to handle frosts, although the beets may lose their leaves, the root will live on. Although harder frosts may kill them.
The winter squashes can be left thru light frosts, but should be harvested once the leaves have died. There's no point in leaving them outside once the leaves have stopped contributing.
The rest is definitely tender. Frost will kill them.

Leave the popcorn also. If the kernels still have enough moisture in them that the frost will do damage, they won't pop for you anyway. Just leave it and let the frost help aid in drying everything down.

Cover the rest of the things for light frosts, but if the temp is going to go down to 28 or lower, covers are likely to fail unless you have a heat source inside of them. So, once you get to the point that the hard frost is expected, pick everything you want to keep. I find plasticized covers such as tarps or heavy canvas works better than cloth such as sheets--slows the exchange of air and heat through the cover, giving a little more protection.

most everything you have is at risk but most of those items can tolerate a light frost if they are covered a few things may even enjoy the colder weather I have beets which are loving the very cool nights . 2 nights borderng frost so far and the pumpkin , sunflowers and tomatos are hanging in there ...the peppers get covered in a christmas light filled clear plastic tent at night lol ,and they are flourishing . Don't take a chance with almost everything you have there ,they are mostly very tender crops which don't like anything under 50 degrees F. 10 Celcius It is not the cold which kills its those ice crystals which form just as the sun comes up .