(Mojave 10.4.2) Missing top right items (clock, network, battery etc.)
The following approach is suggested:


Navigate to the Library folder in Finder



  
  Open Finder
  Use Go -> Go to Folder  (Shortcut: Cmd+Shift+G)
  Type ~/Library and hit Go
  





From the Library, navigate to the Preferences folder.


Locate and remove the file named com.apple.systemuiserver.plist






Navigate to the folder ByHost which is inside the Preferences folder.


Locate and remove the file(s) named com.apple.systemuiserver.[random_number].plist

Restart your computer.


SystemUIServers handles .menu software amongst other things, and thus this is expected to resolve your issue.