Canon Updates Supply Constrained Camera and Lens List, the RF 800mm F5.6 and 1200mm F8 L IS USM Lenses Are Already Included

That the list is so short is perhaps the biggest surprise here. Or, that a lens hood remains on the list.

From Canon Japan (translated):

Apology and guidance regarding the supply status of products

Updated: February 28, 2022 (and March 2, 2022)

Thank you for your continued patronage of Canon products.

Currently, we have received orders for each of the following products in excess of expectations, and due to the influence of global parts supply, delivery delays are occurring. We apologize for the inconvenience caused to our customers and business partners.

The products are scheduled to be shipped one by one, but it is expected that it will take a lot of time for the new camera body EOS R3 and RF lens RF14-35mm F4 L IS USM.

We sincerely apologize for the long wait for our long-awaited customers. We will continue to take measures to ensure a stable supply of products so that we can deliver our products as soon as possible. Thank you kindly look forward for your understanding.

About supply: It will be shipped in sequence, but it may take more than half a year to deliver when you place a new order:

Canon EOS R3
Canon RF 14-35mm F4 L IS USM Lens

About supply: We plan to ship the products one by one, but it may take longer than usual to deliver.

Canon EOS R5 C (added March 2, 2022)
Canon RF 16mm F2.8 STM Lens
Canon RF 100-400mm F5.6-8 IS USM Lens
Canon RF 400mm F2.8 L IS USM Lens
Canon RF 800mm F5.6 L IS USM Lens
Canon RF 800mm F11 IS STM Lens
Canon RF 1200mm F8 L IS USM Lens
Eye cup ER-hE
Lens hood EW-65C