I have meanwhile downloaded the OfficeSuite app from the AppStore as per link below. Note this app is not from Microsoft. It's around $25/year
MobiOffice is the smart choice for office productivity. 5 years and 5 million downloads later, we give people the power to create, edit, comment, format, convert, and protect documents, spreadsheets and presentations - as well as the ability to view and sign PDF files. Compatible with Microsoft...
apps.apple.com
It does work extremely well, as a temporary replacement of MS Office (or permanent for some).
Just 2 things
a) no auto save (but CMD+S as we used to do long ago LOL)
b) can't connect directly to OneDrive for Business account. BUT you can access your SharePoint Libraries and ODfB via the FilesApp (accessible from OfficeSuite directly).
So this just for those in urgent need. It helps me out for now as I need to use Excel daily. The only other big issue left for me is OneNote. Accessing through webbrowser now but it's terrible. Can't even paste anything in. Microsoft 🤬