I think it depends on how it all rolls out. The FDA has to analyze the data and give the OK to distribute it. One of the experts I saw yesterday said that the vaccine might have to be given in two different doses and must be kept at extremely low temperatures (perhaps -100 F). That means that special freezer units must be distributed to various locations. Moreover according to Pfizer, the U.S. is going to get half of the first manufactured doses (perhaps 50,000 doses) and of those much of the first production will go to those on the front lines and most at risk. So I think it will depend on when Trump allows Biden information about the production in order for the government to begin figuring out how to distribute, when it is given the OK to be distributed, if there is any other vaccine that is OK'd in the mean time that is easier to give out and kept, and who is chosen to get it.
It may be earlier than predicted. Keep your fingers crossed. It is too bad that "uncooperative" has been Trump's middle name.