I can say from experience that you may waste a lot of time making it work. I have a great work laptop, but I wanted to push my home Mac Pro as far as it would go, since there isn't much of a reason to invest in something new for occasional use.
It's a 2008 machine with an nVidia graphics card. ArchiCAD 21 works fine on OS X 10.11 El Capitan, but ArchiCAD 22 does not. Since Apple is no longer supporting that Mac Pro for later operating systems (although the specs are still competitive), I had to hack it. After many hours, it does indeed run 10.13 High Sierra (and even did 10.14 Mohave for a time), but ArchiCAD 22 still won't run... it just crashes on startup.
For me, it's kind of a hobby, but if you're depending on it for income, don't waste your time on anything more than 4 years old. If money is a real issue, you can always (*gasp*) go with an inexpensive Windows machine. ArchiCAD gives you that freedom. Once you start raking in the dough, you can go back to Mac!
Chuck Kottka
Orcutt Winslow
Phoenix, Arizona, USA
ArchiCAD 25 (since 4.5)
Macbook Pro 15" Touchbar OSX 10.15 Core i7 2.9GHz/16GB RAM/Radeon Pro560 4GB