Delphinium seed ripening/collection and cutting back for more blooms

In order to get more blooms from the delphinium, I understand the plant needs to be cut back in order to re-bloom in 4-6 weeks. Can I dry these green seed heads, or do they need to dry on the plant in order to fully develop the seeds? I would love to grow more and would hate to waste the seeds, though we still want to enjoy the ones we have for the rest of summer.
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For what you get from a second bloom, I don’t think they’re worth it. I’d rather cut them down and plant something else in the space.
I’ve always got more plants ready to go in.