Rereading your original question, I realize I gave you an answer to a question you didn't ask! Your "accurate as of..." language sounded more like advertising language--not account-opening disclosures. Someone who's more familiar with the rules for account opening disclosures will have to help you with this. You're beginning in a good place, however, if you know the online offering/opening rates are accurate at the time accounts are opened.
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...gone fishing.