I have an APC on macOS, too, and as of a couple of OS iterations ago it recognizes it natively. I used to run apcupsd on macOS, but it was quite tricky to keep it working, due to the USB interface. This was on an older Mac than I'm using now (the trashcan Mac Pro), but it mostly worked and I would always have an indication when it stopped working as the icon in the menubar would change. I think the usual issue was so lock file was owned by root and couldn't be deleted.