There were 41k flights until May 2018 [1]. I was not able to find the current number but with 350 models delivered so far and 4 average flights per day that would sum up to ~500k flights in total at most (but more probably half of that due to ramping up the deliveries).

With 2 accidents the rate is now 4/million. That's at least an order of magnitude difference more than the average of the modern jetliners [2]

Of course, with two events it might be just bad luck but the similarities are concerning, as pretty much everyone observes here

[1] https://randy.newairplane.com/2018/05/22/737-max-a-year-of-s... [2] http://www.airsafe.com/events/models/rate_mod.htm