Porting to Mac is currently cumbersome and restrictive. There are bit depth limitations for images, limitations to the number of maps, and we have no idea as to where the starting event id, map id, and co-ordinates are located (requiring the use of hand-written TSC in the default starting event to fill the gap). Not to mention that there are two different versions of mapdata and weapon data for PowerPC and Intel Macs, both with different byte orders. This allmakes porting to Mac cumbersome.
Also ASM hacks have to be manually rewritten for Mac FOR BOTH PPC AND INTEL, which means that any ASM-based mods are unlikely to ever be ported.
All of this means that unless someone specifies that there is a Mac port there generally isn't one. And even if there is plans for a Mac port you can expect it to happen towards the tail end of a mod's development because of how tedious a process it is.
You are better off playing mods through Wine.