Down to 26 degrees, one sheet won't protect the plants/tomatoes. You'll need a heavy fleece blanket or waterproof tarp, though if it were me, I'd pick all of the tomatoes and not chance ruining my hard work.
It's much easier to line a box with a couple layers of newspaper and lay the green tomatoes - face up - on the paper rather than wrapping them. That way you can see if/when any of the tomatoes start to rot and remove them immediately.
Before we left on vacation, I picked all of my greenies, put them in one layer on newspapers and put them in the cooler basement. Voila, 2+ weeks later, I have 80% red tomatoes to use for sauce or salsa. Only 2 tomatoes had rotted out of 4 boxes. Glad I took the time to pick them all as the temps here got down to -12, or something like that.