Could we have a vaccine for COVID-19 by the end of December 2020?

Pfizer has announced a vaccine with a 90% rate of success. We could have about 50 mil doses by December and 1.2 billion at the beginning of 2021. This is unprecedented and it’s long awaited. People are tired of wearing masks, distancing, so this could provide a way back to the new normal.
Dr. Samadi discusses what are our chances, who will get it, how we can spread it to people as fast as possible.