If they're still in flower
at all, it's a little too early to gather the seeds
Even if the color is starting to fade, I don't think the seeds
are done forming or whatever it is they need to do
before they would naturally fall from the pods.
Wait until the little pods are brown (& fairly dry, although they still might feel a bit moist) before you harvest them.
I'm glad to hear that you had a good crop this year!
... The smell of fresh Basil can't be beat, & I can't imagine having a garden without it!
Oh... If you find a way to smish the teeny-weenie seeds
out of the itty-bitty dried hulls without grinding the prints off your fingertips, please let me know! Every year my fingers get sooo sore from separating the seeds
out while I prepare seed
packets to send to other people, & I'm really thinking about just filling the packets all the way full with the hulls, so they can get the seeds
Good luck with your harvest, & don't be too impatient, because frost won't hurt them.