Reference: Fataawa al-Lajnah ad-Daa.imah lil-Buhooth al-‘Ilmiyyah wal-Iftaa. – Volume 11, Page 212, Question 3 of Fatwa No.7894
Question: Is it permissible for the one performing Hajj to perform voluntary prayers after having offered Salaat az-Zhuhr and Salaat al-‘Asr with the imaam on the Day of ‘Arafah (9 Dhul-Hijjah) until the time of sunset?
Response: The Messenger ﷺ did not perform any voluntary prayers on the Day of ‘Arafah after having offered Salaat az-Zhuhr and Salaat al-‘Asr combined and at the time of Zhuhr (jam’u taqdeem). And if it was legislated then he would have been more careful about performing them than us, and good and all good is in adhering to following his Sunnah.
And with Allaah lies all success and may Allaah send prayers and salutations upon our Prophet ﷺ and his family and his companions.