Here's a quick graph to show the period of time it has taken for each 1 million cases to be added globally.
It's hard to extrapolate of course because it's hard to know when countries will start to get a handle on it but at the current rate we would get to 20M cases globally by the latter part of August. That's still only a quarter of one percent of the global population but it means there will be something like another half million deaths to add to the more than half a million we already have.