How to alert an admin that a credit card used for recurring payments is coming up to the Expiry Date
You could try using our Expired Credit Cards extension:
https://civicrm.org/extensions/expiredcreditcards
https://github.com/agileware/au.com.agileware.expiredcreditcards

This is a CiviCRM extension that automatically creates a new Activity,
Credit Card Expired based on the Credit Card Expiry Date for a stored
credit card token. The Activity Date for the Activity is set to the
1st day of the month after the Credit Card Expiry Date. The Credit
Card Expired, Activity can then be used to set up Scheduled Reminders
to notify the Contact that their credit card is about to expire or has
expired.