Wa Alaikum Asalaam. Yes it is in a Sahih Hadith so it is an established Sunnah:
Abu Umamah (Ra) reported: The Prophet (Sallallahu Alaihi Wasallam) said, “Whoever recites the ‘verse of the Throne’ (ayat al-kursi) after every prescribed prayer, there will be nothing standing between him and his entry into Paradise but death.” (al-Mu’jam al-Kabīr 7406)
So let us make a habit of reciting this Ayaat after every prescribed prayer.