Will the big green tomatoes on them ever ripen? Is this blight, mildew, etc? Is it time just pull the plants?
There is still plenty of time in your zone for tomatoes to ripen.
Do you mean the dark spots, the yellow leaves, or the white stuff all over the leaves? Looks like they have been dusted with something.
Not dusted with anything. The white powdery stuff is getting worse and worse. The leaves are shriveling up and dying and becoming sparser.
I see plenty of ripe/ripening tomatoes. I'd probably pick them and leave the plants alone. Maybe spray with a fungicide and they might hang in there for a while longer.
Keep in mind that tomatoes are an annual plant. Their only mission in life is to produce seeds (i.e., fruit). Once that's done, they begin to die. These plants look fine for late summer. Nobody grows tomatoes for beautiful foliage (although they can look pretty gorgeous in late spring). It's Mother Nature's little plan, like it or not.
You could knock back that fungal infection pretty easy, I'd say they have some time left to make you more fruit.
I have been keeping late blight at bay with a homeade spray. In one gallon of water, mix 2 TBL spoons of Baking Soda and 2 TBL Spoons of any Veg or olive oil, and add a few drops of dish soap. Mix well and spray on your plants.