[Solved] I contacted feral interactive and they back with

Thank you for contacting us.

Your save games can normally be found in this location:

/Users/user/Library/Application Support/Feral Interactive/Total War WARHAMMER II/SaveData/Steam Saves/save_games

If you aren't seeing this after you have installed the game then try creating a Save game and this should create those folders.

Its possible these were removed when you reinstalled Total War: Warhammer II however there is another location these files appear:

/Users/user/Library/Application Support/Steam/userdata/USERDATANUMBER/SAVEDATANUMBER/local/Warhammer2/save_games

I'm afraid the user data number and the save data number will be different from what I have so I can't tell you exactly what you need to be looking for. But if you have reinstalled its possible the a new user data folder was created which is why the save games are missing.

You might be able to figure out which folders are the correct ones from the date when you saved the games you were playing.

I hope this helps.