Musannaf Ibn Abi Shayba 3:3083

Abu Bakr narrated to us, he said: Hushaym ibn Bashir and Abdullah ibn Idris narrated to us, from Husayn, from al-Sha’bi, from ‘Awf ibn Hudayrah, regarding the hour in which [supplication] is hoped for on the day of Friday: [It is] between the emergence of the Imam until the prayer is finished.