This is a very popular subject, so hopefully this will help everyone. When it comes to updates this is the sole responsibility of your service provider. Your options are 1. Contact their tech support. 2. Check their website. 3. Google it.
For example: When will (your phone [ex; Galaxy S10] from [ex; ATT]) get (update your looking for) this will provide some links to look at. It will work. I've done it & also fellow Samsung members have done it.