https://wccftech.com/microsoft-office-apps-now-support-apple-silicon-on-mac/

The good news for today is that the support for Apple silicon is moving forward, with Microsoft also joining the long list of developers who have already pledged and added support for the latest silicon, as well. Microsoft Office apps are now fully supported for the new M1-powered MacBooks, so you should not really have any problems running these apps natively.

The company has gone ahead and introduced a lot of different changes in their major announcement. The changes are rolling out today, and with these changes, apps such as Outlook, Word, Excel, PowerPoint, and OneNote for the Mac are all now optimized for Apple's M1 chip. Not just that, the apps have also been redesigned with macOS Big Sur's design guidelines, and there's more.