My fall tomato plant is loaded. I just hope the fruit get ripe before we get a hard freeze here in central Texas. Lettuce and turnips are doing well.
Have you considered digging it up, and putting it in a pot?
I have done that before a hard freeze, and had some success.
Course, I have also picked the green fruit, washed and dried it, then wrapped in newspaper. It gradually ripened over a couple of months or so, and the taste was far superior to grocery produce around here.