Not to in any way put down the developers on this, because I realize this is a hard problem, but it's been "almost working" for roughly five years. I don't think we should hold our breath on it, sadly.
The Github is still getting updates, at least as of November.
I think part of the problem is that most software that you would want to run on Linux from MacOS are also on Windows, and Wine/Proton already exists. As a result, I think people don't really feel the urge to contribute to Darling when they could just contribute to Wine.
TL;DR: GUI almost working. I assume screenshots will be added when it is.