How sound is the saying that Asiya bint Muzahim and Maryam bint 'Imran will be among the wives of the Prophet (peace and blessings of Allah be upon him) in Paradise?

Allah promised His Prophet (peace be upon him) in the verse: "previously married and virgins" that He would marry him to Asiya, Pharaoh's wife, and Maryam, Imran's daughter. Al-Hafiz Ibn Asakir mentioned that Khadijah's house in Paradise will be between the house of Maryam, Imran's daughter, and the house of Asiya, Muzahim's daughter.