Admins can approve these late check-ins by navigating to Check-Ins – Check-Out section. From the drop-down list select the Pending Check-Ins and you will get the list of all the pending check ins. 
There are two ways to approve the check-ins, either you can do it individually or bulk.
To approve individually click on the particular check in and roll down to Check In Status. Select Approve or reject as per your requirement and click on the Refresh button to save it. 
Note: Once the status is saved you can’t change it.
Select the records and click on the Approve button to approve the check-ins.