Some Android 10 phones are getting Dark mode for the Google Play

It looks like it's still in a testing period, similar to how some got Dark mode in Gmail earlier than most. Google has been hard at work adding dark mode

These apps support Android 10's dark mode toggle - 9to5Google

Google Play Store getting dark mode on Android 10 devices: Report

These apps support Android 10's dark mode toggle - 9to5Google

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Google Play Store shows dark mode on Android 10

Google Play Store gets Dark Mode switch, only available on Android 10

Google Dark Mode app roundup: Everything available so far - 9to5Google

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How to Turn on Dark Mode on an Android Phone or Tablet

This core Google app finally gets Dark theme on more phones running Android 10 - PhoneArena