Could a CZ collection be created for Elsevier ScienceDirect journals that are completely open access leaving out hybrid journals (or what Elsevier terms as "contains open access" or "subscribed & complimentary"). That information can be found on their web site: https://www-sciencedirect-com.proxy.binghamton.edu/browse/journals-and-books?contentType=JL&accessType=openAccess

If a title becomes open access after a specific date, that information can be found on the journals "All issues" page (see attached showing that Advances in Nutrition became OA "31st December 2022").