The worldwide rate is 5% at the moment. The actual rate is something lower than that because many who are experiencing symptoms and staying at home have not been tested and may not be tested and so are not factored into the equation.
However, a very troubling number is that of the cases that have seen a resolution - either a recovery or a death, cases that are still active are not included - the death rate is 19%.
https://www.worldometers.info/coronavirus/
There may not be an effective vaccine until it's really too late to do much good except protect against this same strain in the future. It is too early to say what effect treatments may have. The anti-malarial drugs have shown to be beneficial in very limited use so far. No one knows what the final numbers will look like.
A week ago, the death rate in the US was 1.2%. Today it's 2%.