Welcome to Android Central! It depends on what you mean by "end of support". If you're wondering about security patches, then you're correct, phones with Android 9 would no longer be getting security patches (since Pie was released 4 years ago, and no phone from that release year would still be getting updates -- even Pixels). And phones on Android 9 can't take advantage of Google Play System Updates, which are separate from the monthly security patches, and were introduced with Android 10:
https://www.howtogeek.com/686927/wha...hey-important/
But phones that are still on Android 9 should still be able to run almost every app in the Play Store -- I'm not aware of any major app that requires Android 10 and above.
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