Just depends on how fast and what corners from their normal routine they want to cut. Trials will begin by fall for sure. What they want to make sure is they don’t compound the virus. But what I’ve read they are working on a new RNA vaccine. New field should be quicker and better.
Most likely a vaccine will come out when this has run its course and the body has taken care of it and will not return so the vaccine will come out just in time to prevent something that is already done and no longer a threat.