Supposedly able to buy from the usual regular E-tailers/retailers and probably usual U.S. 9am pdt.
Maybe more definite info 24-48hrs closer to date.
My PC- Ryzen 5 5600x, B550 aorus pro ac, Hyper 212 black, 2 x 16gb F4-3600c16dgtzn kit, NM790 2TB, Nitro+RX6900XT, RM850, Win.10 Pro., LC27G55T.