I've only gotten a few tomatoes so far - lots of green ones, but they just aren't ripening! Very frustrating to see them all sitting there, waiting for...what?!
This happened to me when I reseeded with grocery store tomatoes. I didn't know at the time but they will stay green until exposed to a gas. I'd put them in with other ripe fruit and see if they turn red. Mine were a freebie garden gift from my worm bin castings. I lost all the tomatoes as they had went bad on the vine.
Sorry, I don't know the official process-but try a few and see what happens. Unless you know where these seeds come from, and trust the plant. Otherwise that's my one idea! good luck!