From inception to the second crash, numbers were abysmal. The 737 Max was crashing at a rate of about one per hundred thousand flights, two order of magnitude worse that the 737 NG (one fatal crash per 10 million flights).
Said differently, the Max 8 was working safely 99.999% of the time, while the 737 NG was working safely 99.99999% of the time. An order of magnitude better than 99.99%, but two orders of magnitude worse than expected...
It is certainly a lot safer now. Hopefully even better than the 737 NG.
Yes, there is a better, more accurate method than my napkin math, which was only to provide a baseline most could understand to see we are well beyond the two nines
Some searching says...
1. >1000 flights per day for the family
2. 2 US carriers accounting for more than 200 Max 8 per day
So one would have to get to 20,000 flights after two crashes to get 2 nines. We're well past that threshold