Full qualification of 4.1 in 2022 and 4.2 in 2024. Assuming we sign a deal next year, we will get jets beginning from 2026, even if the 4.2 prototype only begins flying in 2023. The French are expected to get their 4.2s in 2025.
The leased jets will naturally be F3R, F4 avionics are not necessary. They will be returned once the delivery of all 26 jets are completed.
Anyway, they are saying the Rafale is operable from both carriers. The clearance could be frighteningly close on lifts, though, 9.6m Rafale vs 9.3m SH. Whether the removal of the wing tips will actually become a turnaround problem on deck or not will be a crucial factor. Otherwise, the Rafale's platform advantage is far greater than the SH. The only thing the SH has got going for it is the possibility that it can lift a bigger payload and networking with American assets.