The world reacted with great optimism at the news announced in November days after the election that test subjects given a COVID-19 vaccine being developed by Pfizer had 90 percent fewer symptomatic infections of the China coronavirus than those given a placebo.
This was after the November election. Pfizer delayed their testing to not influence the election — for Trump.
President Trump repeatedly said in the fall that it looked like a vaccine might be announced in October. Trump was on the right track, but the science community decided to hold off until after the election.
But way before this the CDC was passing out COVID Vaccine ID Cards to different state governments.