Postgres Stored Procedure -- Scenario-based question

I have a table general_search_terms with two columns term, and dor a date field. I need a postgres stored proceedure that checks for duplicate term values and deletes the record with the latest dor.

i.e. The goal is to basically delete the latest term if a duplicate of a given term is found.

Does this look right, or is there a better way to do this?

CREATE PROCEDURE delete_duplicate_terms()
LANGUAGE plpgsql
AS $$
    DELETE FROM general_search_terms
    WHERE (term, dor) IN (
        SELECT term, MAX(dor)
        FROM general_search_terms
        GROUP BY term
        HAVING COUNT(*) > 1