The Messenger of Allah ﷺ went around to all his wives with a single ritual bath.
حدثنا عبد الرحمن بن مهدي عن سفيان عن معمر عن قتادة
أن رسول الله ﷺ طاف على نسائه في غسل واحد
Its isnad is sahih, as noted previously at 12132.