https://arstechnica.com/gadgets/2020/05/office-for-ipad-is-getting-trackpad-support-later-this-year/

Reports from The Verge and TechCrunch both say that trackpad and mouse support is coming to Office for iPad. The update should be out by the end of the year. Both reports point to the fall as a possible release window, but Microsoft is still working out the exact details.