As you might have seen the new iOS 11 has just released today September 19 2017 and if your wondering how you can get it just go on to your phones General tap in settings then click on Software Update. Will be over 1gb so might take a while make sure your on wifi and have enough battery juice.
List of Compatible devices for ios 11
Screen size of the iPhone X (10) Compared to the iPhone 8 and 8+
iOS 11 – How to Download ? List of Compatible devices