Update, and not good news for those of us looking for 39s
I had my buddy at Discount/America Tire run a nationwide check.
I checked all our nation wide stores and no stock is available. For good measure I reached out to BFG directly, and they to are sold out. The CSR I spoke with said they do not have a planned production date for replacement 39x13.50R-17 KO2 inventory, which unfortunately means no ETA. I also checked secondary suppliers and same result, no stock available - my apologies for the less than favorable news!
FWIW, I looked into what is available in this size, and see limited stock available for the KM3.
I also called tire rack directly today, and they told me their 3/24/23 estimate on their website is not real and it will be delayed as they were told the same thing by BFG.