The Prophet (ﷺ) was asked about the slaughtering, shaving (of the head), and the doing of Rami before or after the due times. He said, "There is no harm in that."
Sahih al-Bukhari Book 25, Hadith 212
← Previous Hadith We performed Hajj with the Prophet (ﷺ) and performed Tawaf-al-ifada on the Day of Nahr (slaughtering). Safiya got her menses and the Prophets desired from her what a husband desires from his wife. I said to him, "O Allah's Messenger (ﷺ)! She is having her menses." He said, "Is she going to detain us?" We informed him that she had performed Tawaf-al-Ifada on the Day of Nahr. He said, "(Then you can) depart."

Sahih al-Bukhari Book 25, Hadith 211 Next Hadith → The Prophet (ﷺ) was asked (as regards the ceremonies of Hajj) at Mina on the Day of Nahr and he replied that there was no harm. Then a man said to him, "I got my head shaved before slaughtering." He replied, "Slaughter (now) and there is no harm in it." (Another) man said, "I did the Rami (of the Jimar) after midday." The Prophet (ﷺ) replied, "There was no harm in it."

Sahih al-Bukhari Book 25, Hadith 213