It’s been given the release number 2025012600, so it should come today.
Keep in mind that I don’t know exactly how it will function but I know that there will both be a notifications which warns that an app uses the Play Integrity API and a toggle for blocking requests to the API (presumably on a per-app basis). There are three levels to the Play Integrity API; MEETS_BASIC_INTEGRITY, MEETS_DEVICE_INTEGRITY, and MEETS_STRONG_INTEGRITY. Apps which check for the basic level will work just fine on GrapheneOS since it passes the check. For the other two GrapheneOS cannot pass without the blessing of Google. What the app being blocked looks like in practice depends a lot on their implementation. This is why the option to block requests altogether is going to be implemented since some apps may ignore the Play Integrity API if it cannot be reached.
These apps (including non-banking apps) almost certain won’t ban your account for using GrapheneOS, they’ll simply limit the functionality somehow, often by blocking logins.