We're still not sure, but we may be on track.
Clearly this is not the only vaccine being tested (I read that there are approximately 100 vaccine candidates in progress) and in the end we may have more than one.

You said (and read) well...in the last 10 days, phase 1 has been completed with the results on the administrations to the 510 volunteers.
So these are really recent news. In fact, it was not easy to find sources on the method of action of the vaccine, there is still no published study and not even a preprint.

The first results are positive, in September we will see how the experimentation on 5000 people went and then we will move on to phase 3.

Surely there will be priority for the funding countries and for the risk categories (doctors, nurses, elderly, immunosuppressed) but if the tests give good results, we could think of obtaining immunization in the short-medium term, i.e. by 2021.