We have the same result today, they approved my and my son's green cards. We also sent only a copy of the my i-864 form with my son's documents (the tax return transcript for the last 3 years was only on my form). NOA1 - June 3, 2024; biometrics - June 24; approval - August 21. We made the cover letter very simple and short (and did not indicate all the documents that we sent)