So, I downloaded the Godot source code from GitHub and later compiled it for x86 system, just like the documentation on the official site said. I opened the new executable file (godot.osx.tools.x86_64) with the Mac terminal and then had in front of me appear the usual Godot editor.
The engine seemed to work fine at first glance, until I tried making a 2d root node and adding to it the provided "icon.png". The engine just crashed right there.
Later, I tried to make an .app version of the "godot.osx.tools.x86_64" executable (as instructed in the documentation by Godot.org), however it did not run, saying "Unable to initialise Video driver", even though I had Vulkan SDK working on my Mac (downloaded with home-brew and later with .dmg from their website).
I tried tinkering with Godot's "drivers" code section and the Godot.app's files, but it didn't help at all.
Did I do something wrong ? Or is it that Godot 4.0 just isn't properly set up to work with Mac yet ?