If you have a UV/black light, you can probably go outside at night and find them pretty quickly and eliminate them. I don’t really have any tomato plants except one small one my gf bought about a month ago. It became clear she was never going to actually plant it so I put it in a 5 gal grow bag with all my pepper plants. But I understand they aren’t above munching a pepper plant either so I’ll be keeping a close eye too.