With the announcement of the intention to supply F-16s it was mentioned that due to various factors, mainly the time to train pilots, they will not be delivered for many months and will not be playing a part in this summer's counter offensive, but would probably be there at some point in the autumn and therefore useful over the winter and into next year.
The rest I guess all depends to how well the counter offensive goes this summer, Ukraine is expected to make decent gains, but probably not enough to push the Russians all the way back to the main border, and Crimea will probably have to wait. And, there's the hope that if the gains are big enough they could trigger a Russian withdrawal, possibly following the assassination of Putin. Otherwise, assuming decent gains, but no withdrawal, it will drag on into next year, OTOH if they don't make decent gains, that's likely to result in outside pressure to do a deal, which doesn't bear thinking of, any peace deal would probably not hold, and the whole shitshow would start again at some point.
But, even if Russia is pushed back/withdraws to the border, it remains possible that air strikes would continue, so the F-16s would have a role there, otherwise just be there in a defence role and ready should Russia decides to have another pop.
But, the bottom line is there're simply too many ifs and buts, so...
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