The first contact safety tip that warns users of a suspicious email which could potentially be related to a Business Email Compromise is a feature that exists today (September 2020).
It can currently be configured using an Exchange transport rule (ETR) or Mailflow rule.
To make it easier for Security Administrators and Security Operations teams, you can now opt-in from within the Anti-Phishing policy section with just a single click rather than the multiple steps required to setup the tip for your tenant using an ETR.
Roll out will begin in late June 2021 and is expected to complete by late August 2021
How this will affect your organization:
Once available, you can opt-in using Anti Phishing policy and enable First contact safety tips. If you wish to continue using an ETR you have setup for your organization, you can maintain it and do nothing.