Apple did launch the M2 on the MacBook Air in June 2022 more than 6 months before they added the M2 Pro to the Macbook Pros in Jan 2023. In single-core the Air was faster, though not in mult-core.
Why would it have to be Spring? Apple could update the MacBook Air with an M5 in July with an announcement in June. They just updated the MacBook Air to include 16GB of RAM, which buys them a few months.