Peas will keep growing if they get some sunshine, but may not set fruit unless they get a nice warm day when flowering. They keep doing their magic with nitrogen fixing however. Fortunately, the young foliage is edible and delicious. Worth a try pretty much wherever and whenever.
This is just my opinion, but I’d rip out the pumpkins and tomatoes (they are very unlikely to ripen now) and plant something else to keep the soil healthy. The pea/bean tribe would be excellent. Then come spring you can rip them out and plant your pumpkins again.

If you want to do onions/garlic in those pots, then manure and bugs will be very beneficial. The onion/garlic tribe take a long time to mature (comparatively), so planting now or soon makes sense for harvesting in summer next year. Leeks are quicker to mature so maybe think about planting these in late winter. Leeks do pretty well planted fairly close together, so they are space saving. I have to say that homegrown leeks are bloody marvellous, far nicer than shop bought. They tend to be thinner but so much tastier.