Nokia Mobile is a bit slow lately in the delivery of monthly security updates. Many of their devices are still waiting for Android 11 and latest security updates, like Nokia 7.2 or 7 Plus. But, some devices are getting it and Nokia 9 PureView is among the few that got May security patch.
The update itself is 31 MB in size and it is available globally. If you are playing with Nokia 9 PV camera now, do check if the update is available for your device.
This update will not bring you the joy of larger OS update which should be coming in late Q2 or early Q3 of 2021, but it is still nice to have your device patched up.