News picked up by VideoCardz suggests the actual product availability date is either October 20th or October 27th. Yuri Bubliy, the creator of ClockTuner for Ryzen, heard the Ryzen 9 5900X and Ryzen 7 5800X will ship on October 20th. He also claims that AMD's RDNA2-based video cards will be available around November 15-20.
German tech site ComputerBase says the launch date of the first Zen 3-based desktop processors is either October 20th or October 27th.
Zen 3 - 20th October (5800X/5900X)
— Yuri Bubliy (@1usmus) September 30, 2020
Navi 2 - 15-20th November
This is old information, but I can see that AMD has not adjusted the plans.