They also did not take $ from Operation Speed Warp so I think they waited till now to keep this apolitical.
https://www.pfizer.com/news/press-release/press-release-deta...
First, this is a line of research that began in January well before the pandemic actually got out of hand. Researchers started developing a vaccine as soon as there were indications that the transmission rate and fatality rate would be high.
Second, Operation Warp Speed was announced in early April. This was already long after the pandemic had gotten out of hand.