Another (macOS) Code signing guidance question...

[Paul Dupuis]

I am looking at https://developer.apple.com/support/xcode

To meet Apple's Nov 1 deadline of switch from the old Notarization tool 
(which I current use on Mojave) to the new one, I need to get set up on 
macOS 14 Sonoma.

To me, from the Apple page, it look like I need xcode 15 (deployment 
targets of macOS 10.13-14) BUT I am concerned that the Livecode lesson 
by Matthias and his mrSignNotarizeHelper tool recommend Xcode 13 or 14 
(I don't see Xcode 15 mentioned). I may have (or probably did) miss 
something!

The Apple Developer page suggest that Xcode 14.3.1 has a minim OS 
requirement of macOS Ventura 13 which suggest it can run on macOS 14 Sonoma?

I only have a single macBook Air with Sonoma available to get sup up for 
the new notarization method. I really don't want to try to downgrade the 
macOS (I don't even know how to do that).