As far as I can see there is no reliable figure for mortality. We can see how many of detected cases have died, but some of the cases might still die, causing the figure to rise. There will be variations from country to country, depending on the health facilities, while doctors wil be learning more about disease management as time goes by, so previous death rates will reduce. The biggest factor, however, is likely to be the number of unreported cases because symptoms are very mild, meaning we have a reasonable figure for deaths, but none for the total number of cases.
I know it's annoying to just not know about something so important, but I think that's just the way it is.
I agree that the final/accurate number won’t be known for a long time, or maybe never.
But everyone who is even close to being an expert in such fields do say that mortality rate is significantly higher than flu. How much? Who knows. It is far from “just the flu” though.