Since your FBAR and tax return are not tied to one another, I can't see any reason to delay filing your FBAR for 2024. It is best to wait for a refund when amending in most cases, but in your case since 8938 doesn't change the tax owed or refund due, it should be okay to proceed with amending to include the forms now.
You could also choose to file an extension (which I realize seems odd given that you've already filed, but it would extend the due date on the Form 8938).
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