AFAIK tomatoes are picked when they are red, but there are species like this one (which I don't know what are they) that if I knew what it is I would be able to know if they are ready to pick. I saw some similar to this one that are picked with a similar colour.
by Country_Global
1 Comment
You can pick once they start to change color like the slightly red one up there and leave on the counter to ripen. However, I like to leave them on the vine a bit longer as I feel like that helps them develop flavor. Not sure about the variety though. ID from sight can be pretty difficult.