That's a good question but also a difficult one to answer. I can't tell you when, but I can tell you that there is a lot going on for it. The trials are being conducted for something as novel as RNA vaccines. There are a few groups who have developed monoclonal antibodies against the virus and some more who are still in process. There are others who have claimed some success with inactivated virus in rats and macaques. But that's the thing most of it is in early development or early human trial. Even the Oxford one was tested to work in macaques. They are running phase 1 trials now. You can read this to see current state of some efforts.

Now the phase 1 trial will mostly test the safety and immunogenic potential (ability to mount immune response and produce antibodies) in small group. We have to wait at least until phase 3 to be sure if vaccine is both safe and effective against the virus. Some of these efforts would leas nowhere. Those that do may take at least a year (that is most hopeful scenario) to two (more realistic though still bit wishful scenario). If everything works out just fine, the approvals are accelerated then 1-2 years is wishful but doable. That is what I think is the scene.