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Flight Instructor Instrument Practical Test Standards for Airplane and Helicopter (FAA-S-8081-9D) is current in 2023. ASA reprints the most current FAA Practical Test Standards (PTS) in this series of handy cockpit-sized guides. The PTS guide students, instructors, and FAA-designated examiners through checkrides. Written by the FAA, these books list the knowledge and experience prerequisites, the levels of skill that must be demonstrated before an examiner can issue a certificate or rating to an applicant, and describe background study and reference materials.
Just like the CFI PTS, the ACS version of this needs to come out. There are no specifically listed completion standards in these old versions like the new ones. The ACS is so much clearer.