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Sorry about the delay—I looked into this for you, and my sources are telling me that the new MR for the S10 will include night mode! As @Shaggyskunk1 said, it's scheduled for release in the second week of July 😊
I was also able to get confirmation that night mode will be coming to the S9, slated for a late July release. Of course, I can't guarantee these release dates for sure... but I hope this answers your question!