Mine are hanging on, big and green, but I planted late and I don't think they flowered before the heat came.
I've read/seen that if the plants don't flower before the nighttime temps get above 75ish and daytime temps get above the 90's you might have trouble getting fruit. Anyone else heard this?
Yeah, this is true, they won't set fruit in this kind of heat. The blossoms, if you get any, will just fall off.
You can try to force some fruit, though. Watch for a cool down on the forecast, like a little rain coming through or whatever. A few days prior to that cool down, apply a blooming fertilizer, something with a much higher middle number. This will bring on blossoms, and, if all goes well, you will set some fruit during the short cool period.
The only other option is to plant some grape and cherry tomatoes. These will set pretty well even in the high heat.
Good luck!