Let me look in the crystal ball... probably after the 5th. Then you'll have to wait for shipping and such. Unless you are near a place that you can buy in person which in that case you should ask them.
That is not the way retail works your larger stores already have boards and processors in stock but will not show them till the release date of the CPU.
The motherboard manufactures get samples long before the release date to perfect their boards.
This is not saying all the different models of the boards that are going to be made for that socket will already be made.