I would hold off on harvesting the seed pods. I'm in SW Washington state, and we're still getting some sunny days. I've found that when the leaves and stem die off and turn brown, the pods will soon begin to split. That's a good time to harvest, and you will find that the seeds are brown. If the pods start showing dark brown mildewy circles, harvest them right away and store in a warm, dry place with air circulation. It will take several weeks to dry the seeds enough that they can be frozen or stored in an airtight container.