Very pretty flower! You can see the pod decide to open, when it finally does. The seam turns brownish and begins to split. Mine haven't popped, they take a day or two to open. Man, slow slow slow with everything! I put half a plastic bag over mine, and use tape to close the gap underneath. Leaving plenty of air circulation. I like the pod to stay on the plant as long as possible.
From pollination to seed is usually five months. Hmm, you have a double pod, looks like. Good fun, maybe 100 seeds!