The $QUICKAPPROVALURL tag is available in the Timesheet is waiting for approval and Timesheets are waiting for approval (Batch) e-mail notifications.
When enabled in the e-mail notification, the approver will get the notification e-mail with two URL's:

  • A Web TimeSheet URL to access the application on a desktop.
  • Go to Approvals link to access approvals page on a mobile device.

On clicking on the Go to Approvals link in the e-mail, the approver will get a page similar to the picture shown below, using this page the timesheet(s) can be approved.