I saw on Google play that the app version was 21.1 and that it was updated on the 6th May. Is the actual update out (not the beta update)
Nothing has been announced as to if the update is out.
Could you provide a screenshot of what you are seeing?
v21.01 has not been released to the public - it is still in beta testing. v20.03.04 is the most recent RTM version.
If you are enrolled in the open beta program, it is possible that you saw the latest build (iOS: 21.1 (959), Android: 21.1 (1496)).