The software versions are N960NKSU3ETD1 and N960FXXU5ETD5 for the Korean and European countries respectively.
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Samsung Korean community manager has now confirmed that the stable One UI 2.1 update is coming in June 2020. Although, you can get this early at the end of May.
The community manager said:
Note9 OneUI 2.1 SW is expected to be released in June. This is because we are doing our best, but we need physical time to apply OneUI2.1 to Note9. As many members and others have said, if you wait with a little time, we will prepare well and try to deliver it as soon as possible.
Samsung launched the Galaxy S20 series and Galaxy Flex with the One UI 2.1 in February 2020. After the official launch, the company already updated the Galaxy Note 10, Galaxy S10 series, and some other devices to One UI 2.1 in March and April.