Is dedicating time to recite the Qur’an and perform two rak’ahs of prayer for the deceased considered part of the religion, and what is the legitimate شرعية advice regarding that?

Scholars have unanimously agreed that the benefits of charity, supplication (du'a), seeking forgiveness (istighfar), Hajj, and 'Umrah (definition) reach the deceased. They differed regarding fasting, prayer, and reading the Quran, but the majority opinion is that the deceased benefits from these as well. Innovations (bid'ah) can attach themselves to permissible acts, such as dedicating the recitation of specific surahs or at a specific time, or performing them in congregation, and consistently adhering to that. If your friend has dedicated a specific time to gift the reward of his deeds to his mother, then this dedication is prohibited. However, if he is only able to do so at this time due to his work circumstances, then there is no harm, along with the advice to limit himself to the deeds that are agreed upon, such as supplication, seeking forgiveness, charity, Hajj, and 'Umrah.