That's the rub, isn't it. It's called Vax Roulette, and in days, weeks, months or years you'll have your answer.
iirc all coronavirus vaccine efforts (I mean real vaccines) historically have often had problematic long-term issue profiles.
I know public health (corporations, bureaucrats, and politicians) will just keep doubling down on this, but you cannot vaccinate against a coronavirus for any longer than it takes it to mutate around it, and that doesn’t even touch on experimental technology with a few months of perfunctory studies designed to avoid any chance of showing problems.