1. Create a new query
  2. Filter on:
    Gift Type equals Recurring Gift
    AND Next Transaction Due Date equals This Month  (This date range can be modified to meet your needs)
NOTE: If you want to find Constituents with a recurring gift with the Next Transaction Due Date, you will use a Constituent Query to get the group of Constituents.
If you want to find the specific Recurring Gift records with the Next Transaction Due Date, you will use a Gift Query.