There is no announcement of a 2022 Z06. Judging by all the supposedly Z06 camo cars it's assumed they will release it as a 2022.
So assuming it will be a 2022 and another assumption that 2022's will start in September then I'd think they will release them, like the HTC, half way through the 2022MY. Which would be February to April kind of thing. A lot of assumptions there though.
Many think the 2022's might not start until November of 2022