Maintenance for the week of October 27:
• [COMPLETE] PC/Mac: NA and EU megaservers for maintenance – October 29, 4:00AM EDT (8:00 UTC) - 12:00PM EDT (16:00 UTC)
• [COMPLETE] Xbox: NA and EU megaservers for maintenance – October 29, 4:00AM EDT (8:00 UTC) - 12:00PM EDT (16:00 UTC)
• [COMPLETE] PlayStation®: NA and EU megaservers for maintenance – October 29, 4:00AM EDT (8:00 UTC) - 12:00PM EDT (16:00 UTC)
Maintenance for the week of October 27:
• ESO Store and Account System for maintenance – October 30, 9:00AM EDT (13:00 UTC) - 6:00PM EDT (22:00 UTC)
From this morning's PTS Patch Notes
The issue many Mac users have been experiencing is specifically called out for a fix:

This is the first time I've seen the "Mac game client" specifically named in the patch notes. I plan to test this out on PTS, and encourage other Mac users will do the same. I'm cautiously optimistic.