By the way, I’ve grown Opalka for several years and it often looks pretty sad but still pumps out tomatoes. The first year I grew it, my mom, a master gardener, was walking around my garden and told me I better water those tomatoes or they’d be dead… I had just watered them that morning and they were fine.
It looks like a few spots on them as well as the curling, so hopefully it isn’t a disease, but overall I’d guess just too much temp and light hitting those top leaves.
I don’t know where you live, but if Arlington, VA is driveable for you and you loose these, I have about a dozen going and can certainly spare at least 8. I grow way more than I can ever use, but give them away to neighbors, the PTA plant sale, etc.
My biggest problem with Opalka is blossom end rot and I just haven’t been able to keep the watering consistent enough to get ahead of it. I just started another 3 Opalka last week and some Maxifort and RST-04-106-T rootstocks hoping that maybe growing them grafted might put a root system under them that somehow helps with the BER. They’ll be late going in at this point, but we have long enough growing season to try them as a test.