2021 or 2022. Although I can't imagine any of them working well.
If they develop one, bigger question is, how effective would the best working one(s) even be? Humans not being able to develop anything aside from very short term antibodies to the coronavirus, makes a working vaccine prospect to be very bleak.
Innovations of antiviral and post-infection treatments however, it seems like they are making good progress on. So maybe that will end up being the focus more than the vaccine itself.
I think it's highly probable that before we ever develop an efficient vaccine, the virus would've dissipated to non-pandemic levels, or it would have mutated to the point of being way less deadly, leading to the demand for the vaccine to wane and they will just abandon on its development.
The truth is strictly what the ones in power perceives it to be.
Enjoy any good things, even the little and menial ones, as you will never know what impending distresses could descend upon you in a moment.