'Aishah (May Allah be pleased with her) reported:
If the Prophet (ﷺ) could not perform four Rak'ah before Zuhr prayer, he would perform them after it (i.e., after the obligatory prayer).[At-Tirmidhi]. (ID)
App reference (ID): Book 9, Hadith 128 (ID)
Arabic/English book reference (ID): Book 9, Hadith 1118 (ID)