Canon is expected to ship the Canon EOS R3 starting November 26, 2021. I expect to get mine by the end of this month, at the latest. For those who can't wait to get their hands on one, here are the Owner Manual and Technical Manual.
Download them to peruse all the wonderful features of the camera and get a head start. After I have taken delivery of the EOS R3 and the RF 100-500mm lens, they will accompany me on a few real world wildlife safaris under the most demanding situations and I will write a complete review of the camera. I will have the EOS-1D X Mark III body with me as a comparison. Keep checking back for the latest information on the EOS R3 body.