[ytch]

they usually release Pro or Max model later:

M4: May 2024

M4 pro/max: Oct 2024

https://www.apple.com/newsroom/2024/05/apple-introduces-m4-c...

https://www.apple.com/newsroom/2024/10/apple-introduces-m4-p...

[nsteel]

M3: same time

https://www.apple.com/newsroom/2023/10/apple-unveils-m3-m3-p...

M2: June 2022

M2 pro/max: Jan 2023

https://www.apple.com/newsroom/2022/06/apple-unveils-m2-with...

https://www.apple.com/newsroom/2023/01/apple-unveils-m2-pro-...