They could have announced this months ago.
Can't help the Orange Man, don'cha know.
Pfizer started Phase II/III testing on July 27th,
https://www.pfizer.com/news/press-release/press-release-detail/pfizer-and-biontech-choose-lead-mrna-vaccine-candidate-0 . So if by "they" you mean Pfizer, Pfizer did not have this testing data months ago.
OTOH, the MSM have been almost studiously silent on the vaccine development progress by AstraZeneca, Moderna, Pfizer, J & J, and Novavax (and several others who are in earlier test phases). If by "they" you mean the MSM, you are basically correct.
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I really wondered whether the comment attributed to Cuomo was accurate and in what context he said it. More:
GOV. CUOMO THREATENS TO STOP VACCINE DISTRIBUTIONhttps://www.outkick.com/andrew-cuomo-vaccine/While speaking to political partisan George Stephanopoulos — what a combo — Cuomo said the news is “bad†and that he will need to figure out a way to stop distribution before it does damage.
Here is Cuomo putting politics ahead of the country:
...
“The bad news is that it’s about two months before Joe Biden takes over and that means this administration is going to be implementing a vaccine plan,†Cuomo starts. “The vaccine plan is very important. It’s probably the most ambitious undertaking since COVID began.
“The Trump administration is rolling out the vaccination plan, and I believe it’s flawed.â€
Cuomo concluded, “I’ve been talking to governors across the nation about that – how can we shape the Trump administration vaccine plan to fix it or stop it before it does damage.â€
Cuomo is such a hyper-partisan Trump-Hater that I really can't tell whether he is so ignorant that he doesn't know these vaccines are being tested by hospitals and universities, not by Donald Trump with a kids' chemistry set in the WH basement, or whether he knows full well the vaccines are being properly tested but can't stand Trump getting credit for this huge accomplishment.