Sort ready for pickup holds by expiry date in checkout function
Staff assisting any customers who cannot pickup all their ready holds at once, would benefit from seeing and sorting the expiry date of holds in the patron's holds list. This will assist with preventing their holds from expiring and being placed again.

An item's status and pickup expiration date are displayed in the status bar at the bottom of the Holds page as an item is highlighted/selected. While you can't sort by the expiration date, this information is displayed on screen for staff users.
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Shawn P. Farrell commented
A tooltip that displays as you hover over Ready for Pickup titles might be useful.