Drow, I don't think it's a little behind, if around 80% don't have symptoms it seems plausible that that there are 4x as many cases as documented (at least, that doesn't include mild symptoms where people don't think to get tested) as these people have no reason to be tested. I think you can divide by 4 conservatively the current mortality rate.
The other factor to keep in mind is that different health care systems are going to have drastically different mortality rates. Germany is currently running 0.3% . . .
Germany, Switzerland, Japan, South Korea, Sweden, Norway, Denmark are all under 1%.
https://www.worldometers.info/coronavirus/
Personally, I think when all is said & done in a good health care country we're going to be well under 0.5% mortality.