Two hadiths have been reported form Prophet Muhammad (peace and blessings be upon him) about the virtues and benefits of Surah Taha. However, there are many weak hadiths about the virtues of the Surah. For more, please see the detailed answer.

Subhana Rabbiyal Azim means glorifying the One Who possesses ultimate greatness. Subhana Rabbiyal A’la means glorifying the One Who is exalted in His Essence.