It is not too late to update. Follow this link. You can still update via "Kies". I got this from chatting with tmo tech support.
If you have problem with connecting your phone with your computer, this should help. http://support.t-mobile.com/message/145401
Yes. If updating with Kies for Mac worked, I would have done it long ago. It is pretty well-documented that despite what the official support notifications say, firmware cannot be updated via Kies for Mac.
Could someone explain better how OTA updates work? We've never been anything but T-Mobile customers, and the phone was actively on T-Mobile from the roll-out to the last day. There are genuine issues with the phone that the update would fix, and I do not understand why it did not come OTA.
The last update I got from T-mobile was far simpler. The update file was made available for download. You download it, put it on the phone, press software update, and all is well.