As TMO's own Jeff Gamet points out in this previous article, you can turn Reachability on for the iPhone X; this is an easy way to bring down the top of the screen on Apple's shiny new device... On any iPhone that isn't the iPhone X, you can see your battery percentage right at the top when the setting is on. But on the iPhone X, the setting has disappeared and at first glance, it appears that the battery percentage has too. But fear not; to check battery percentage on the iPhone X, you merely need to open Control Center.
For iPhone X, and those running iOS 12 or any other later version, swipe down the screen from the right corner at the top to open the control center. Tapping on the scanner widget will open the camera to facilitate the QR code scanning.
In models of the iPhone that have Home buttons, Control Center has always been opened by swiping up from the bottom of the screen. Control Center on iPhone X and later phones cleverly uses the notch at the top of the edge-to-edge display.