Hasn't been formulated yet, let alone tested (takes many months), manufactured and distributed.
The Moderna one was formulated a few weeks back, is being tested on animals and they are expediting human testing to run in parallel, which is unusual.
It is, however, using some funky new tech which is far from guaranteed to work...
https://www.statnews.com/2020/03/11...s-vaccine-trial-without-usual-animal-testing/