Is the Hadith that mentions Surat Ar-Rahman will come on the Day of Resurrection in the form of a human and intercede for whoever habitually recited it, an authentic Hadith? And what is the virtue of Surat Ar-Rahman?

The Hadith "Everything has a bride, and the bride of the Quran is Ar-Rahman" has not been found to be مرفوع (directly attributed) to the Prophet, peace and blessings be upon him. Weak Ahadith have been narrated concerning the virtues of Surat Ar-Rahman, including what Al-Bayhaqi narrated from Ali and Fatimah, may Allah be pleased with them both, and both are weak in their chain of narration, as mentioned by Al-Albani.