The nights are starting to get cold so they probably won't ripen outside. It's what I've found too - outdoor tomatoes in Scotland grow a lovely crop of green fruit on sturdy plants, but you need to bring them in to ripen them.
I'm wondering whether if you pulled up the plants, root and all, then hung them upside down in the tunnel, if you would get at least some ripe ones, at least the ones which look mature now. Once a frost threatens remove all the green ones and make your chutney.