Sheikh 'AbdulGhaniyy Al-'Umari ḥafidhahullāh states:

"وعليكم السلام ورحمة الله وبركاته The pilgrim, may Allāh bless you, should perform the stoning after Zawāl, regardless of whether directions have been issued [contrary to this] or not. Directions were issued by the Prophet ﷺ that the stoning should be performed after Zawāl." ___ Sheikh Abdullah Al-Iryāni ḥafidhahullāh responded: وعليكم السلام ورحمة الله وبركاته. لا يرمي إلا بعد الزوال ولو في الليل. "He should not perform the stoning until after Zawāl, even he has to do it at night (*)." (*) It appears these directives were issued due to the severe heatwaves. However, this (stoning at night time or after Asr; when it is cooler) is a better alternative. __ Sheikh Muhammad Hishām At-Tahiri ḥafidhahullāh said: "وعليكم السلام ورحمة الله. يرمي بعد الزوال بساعتين يبرد الجو، وإن رمى قبل إما أن يعيد أو يجبره بالصدقة." "He should perform the stoning two hours after Zawāl when the weather cools down. If he performs it before Zawāl, he must either repeat it or compensate with a charity." Sheikh Ḥasan Bā Shu'aib ḥafidhahullāh said: وعليكم السلام ورحمة الله وبركاته. لا يجزئ الرمي قبل الزوال. ونحن موجودون في الحج ولم نر أي ضرورة تستدعي تقديمه على الزوال. "It is not permissible to perform the stoning ritual before Zawāl. We are currently performing Hajj and see no necessity to advance the stoning before Zawāl." _ NOTE: Majority of scholars (Jumhoor) say it is obligatory to offer an expiatory slaughter if someone performs the stoning before Zawāl during the days of Tashreeq. Fatwa of Sheikh Ibn Baz ⤵️ https://binbaz.org.sa/fatwas/17211/%D9%88%D9%82%D8%AA-%D8%A7%D9%84%D8%B1%D9%85%D9%8A-%D9%81%D9%8A-%D8%A7%D9%8A%D8%A7%D9%85-%D8%A7%D9%84%D8%AA%D8%B4%D8%B1%D9%8A%D9%82-%D8%A7%D9%84%D8%AB%D9%84%D8%A7%D8%AB%D8%A9 Sharh Al-Mumti' of Sheikh Uthaymeen ⤵️ https://books.google.co.uk/books?id=pSYbmczZDuUC&pg=PT351&dq=%D9%8A%D9%81%D8%B9%D9%84+%D9%87%D8%B0%D8%A7+%D9%81%D9%8A+%D9%83%D9%84+%D9%8A%D9%88%D9%85+%D9%85%D9%86+%D8%A3%D9%8A%D8%A7%D9%85+%D8%A7%D9%84%D8%AA%D8%B4%D8%B1%D9%8A%D9%82&hl=en&newbks=1&newbks_redir=0&source=gb_mobile_search&sa=X&ved=2ahUKEwi24-z2kuSGAxXRU0EAHZaTBRkQ6AF6BAgLEAM#v=onepage&q=%D9%8A%D9%81%D8%B9%D9%84%20%D9%87%D8%B0%D8%A7%20%D9%81%D9%8A%20%D9%83%D9%84%20%D9%8A%D9%88%D9%85%20%D9%85%D9%86%20%D8%A3%D9%8A%D8%A7%D9%85%20%D8%A7%D9%84%D8%AA%D8%B4%D8%B1%D9%8A%D9%82&f=false __ In the case where one is forced to perform the stoning before Zawāl, due to constraints, such as fearing that his group will leave him behind and there being no one to assist him - especially if he has dependents, then there is no expiatory sacrifice due upon him. Sheikh Najeeb Ash-Shar'abi ḥafidhahullāh stated: إن كانت الضرورة التي حملت على الرمي قبل الزوال قائمة، كما في الصورة التي في السؤال فلا حرج، وليس عليه دم. وإن أمكنه أن يعيد الرمي بعد الزوال فهو أحوط، وإن لم يمكنه أجزأه إن شاء الله. "If necessity led to performing the stoning before Zawāl, as described in the question, then there is no harm, and no sacrifice is required. If it is possible for him to repeat the stoning after Zawāl, that is more cautious. However, if he cannot, it is sufficient, inshaAllah."