While I work out issues with Xcode 12, I have released a Monal 4.9 build for Mac using Xcode 11. I hope to have an arm native build as soon as the code signing issues in Xcode are resolved. I am talking to Apple about it.
iOS 4.9 beta has been out for a week or so. The mac beta is on its way. I would like this will support the new M1 processors if possible. I am running into some issues with signing on Xcode 12 that is blocking it at the moment