بسم الله الرحمن الرحيم
Yes, the virtues of abovementioned Surahs are proved from Hadith. One should regularly recite them. Weak Hadith is reliable in the chapter of virtues provided the weakness is not of severe types. The virtues of the said Surahs are mentioned in the reliable and authentic books of Hadith. It is recorded in Shu’ab al-Iman of Imam Bayhaqi:
عن ابن مسعود قال قال رسول الله صلى الله عليه وسلم: من قرأ سورة الواقعة في كل ليلة لم تصبه فاقةً أبدًا، وكان ابن مسعود يأمر بناته يقرأن بها كل ليلة .
Abdullah Ibn Masood (rz) narrated that the Messenger of Allah (may peace and blessings of Allah be upon him) said, “Whoever recites Surah al-Waqiah every night, he will never be afflicted by poverty. And Ibn Masood (rz) used to order his daughters to read it every night.” (Shu’ab al-Iman 4/120, number 2269).
And the following is reported about Surah Mulk:
عَنْ أَبِي هُرَيْرَةَ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ إِنَّ سُورَةً فِي الْقُرْآنِ ثَلاَثُونَ آيَةً شَفَعَتْ لِصَاحِبِهَا حَتَّى غُفِرَ لَهُ، وهي تَبَارَكَ الَّذِي بِيَدِهِ الْمُلْكُ.
It was narrated from Abu Hurairah (may Allah be pleased with him) that the Prophet(may peace and blessings of Allah be upon him)said: “There is a Surah in the Qur’an, with thirty verses, which will intercede for its companion (the one who recites it) until he is forgiven. This Surah is: Tabarakal-ladhi.” (Ibn Majah Number 3786, Musnad Ishaaq Bin Rahviyah, Number 122)
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.