I would be patient - unless you expect a frost to come, at which point pick and ripen inside. My mum used to keep them on trays in the garage in the cool, then bring in a few at a time & ripen (yes, in a brown paper bag with a banana in it). Any that have started to turn at all, even if they are only going a lighter green, will ripen fine. If you expect a one off frost you can put down straw, detach the plants from their canes and lay them down on the straw with fleece over them. I would pinch out the top of the plant to stop it growing any further. Luckily we have a polytunnel, it is so wet here that outdoor toms always get blight
Found a caterpillar munching on one of my cherry toms today - there were loads of half-munched ones. Later on, there was a wasp munching on a half-rotten tomato on top of the soil. Went back half an hour later and this wasp was rolling around twitching. That rotten tomato must have fermented. It must have sobered up and flown off cos it was gone an hour later. Either that or the goddamn caterpillar ate THAT as well.....
Mine are tumblin' toms type. What have not been munched on are VERY small, even at the point of starting to turn red. Why are they so tiny?! We have a south facing patio but have had hardly any sun this summer - is that the only reason for them being so crap? They were shite last year too. Good the year before (although picked 'em in October - ripened brilliantly on a sunny window ledge).
if they are still green in a few weeks or so and, my dad always picked the toms, made sure they were dry and wrapped placed in a box with layers of newspaper and kept in a cool dark place. the tome would ripen slowly on their own (its the chemical they give off xylene or something like that) and we had toms all over winter. sometimes my mum would make the green toms into chutney too. I have many many green toms on my plants still, I pick about 15 toms each day as they ripen but usually opick them while a good orange colour, and place them on a window sill where my son can reach them when he fancies one as they go red. picking a bit earlier like this helps the rest left on the plants.
OOh good advice here, I was despairing of ever getting a red tomato! We are supposed to have a warm sunny September so fingers crossed! I've stripped mine down to a virtual single stem and pinched out tops apparantly that helps.