One UI 4 Update

No, because a50s was originally released in Android Pie 9 (One Ui 1) which can be only upgraded to Android 11. And its a midrange phone.

2 major updates for budget and midrange phones

3 major updates for flagship phones

Phones that were released in 2020 will now receive 3 major OS updates and 4-year security updates (Basically, phones start running Android 10). Samsung Galaxy A50s was released in 2019 and running Android 9 so Android 11 was the last major update.

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As per your concern, we just have to wait and see! 😊 Stay safe and have a nice day ahead! 

the A50s has the same fate of my A10 and will no longer received major updates and now both of this latter moved from quarterly updates to Biannual updates which means we will only received 2 or twice security updates or patches per year and that is a very long run but Samsung has still support of our devices through this security updates.