After updating iTunes to version 12.7, I am sure that you have noticed that there is no section to update or install apps in iTunes. The only way to gets your apps updated is via the App Store in your iPhone.
Follow the procedure given below to check for any available app updates on App Store on iOS 11:
- Tap on App Store on the Home Screen.
- Tap on “Updates” at the bottom of the screen.
- Pull the screen down using one finger or two fingers until you see the spiky circle appears.
If there are any updates available, they will be listed and you can get them updated by tapping on Update All.
 9to5Mac. 2017. iOS_11_Homescreen | 9to5Mac. [ONLINE] Available at: https://9to5mac.com/2017/06/05/ios-11-preview-first-look-at-apples-latest-mobile-os-gallery/ios_11_homescreen/. [Accessed 05 October 2017].