A quick update. He's using talking typer on an ipad as they no longer own a windows machine. He's learning it slowly but progressively.

I forgot to mention that his is a native Taiwanese. He can speak english-but voice recognition apps like Alexa and Siri have a hard time with his accent. He is much more proficient in chinese. He recently discovered a new keyboard plugin called buxiamy.

Hopefully he will become proficient at the keyboard to give him the freedom of the internet.

Thanks!

I know there are Braille overlays for computer keyboards, but I'm assuming this won't help him as someone who doesn't know Braille. I did a quick google search for overlays that had raised print letters, but haven't found anything yet, unfortunately.
If he can't immediately find a typing program for the mac and doesn't have easy access to a Windows / iOS machine, he can press ctrl+option+k to turn on keyboard help mode. This is not an interactive typing lesson of any sort, but it does echo back every key that is pressed. So if he were in the middle of writing a document and couldn't remember a letter, he could turn it on, find the letter, turn it off (by pressing escape) and continue writing. I never used a typing program but picked up the keyboard pretty quickly by doing exactly the same thing with JAWS (a Windows screen-reader) and its own keyboard help mode.

Good luck.

He can practice writing sentences on a magic keyboard (bonus functionality of more keyboard commands and voiceover shortcuts that I am not sure if generic bluetooth keyboards can perform or any bluetooth keyboard and voiceover in the default iPhone notes app as well. Talking Typer seems like it was originally aimed at kids, its almost condescending sounding.

honestly I don't think ya need a specialized program. Unless a "reward" is needed like a silly pencil telling you your doing a good job. Should be able to get away with a basic text editor. Jaws should take care of feedback. When I learned touch typing the instructor taped a piece of paper over the keys so we wouldn't look, point is we learn where to place our hands with pointer fingers on F and J keys, and through out the hour we would practice typing one key at a time.

a a a a a a a a a a a a a a

After a couple of minutes, work on s, then d, f, and so on, yes it will get mind numbingly boring and feel like a mary-go-round re-practicing yesterdays keys at times but it's to train the hands to have muscle memory for each key. Next step is practicing two keys at a time. And where learning Shift, Control, or that squiggly cubeish thing on the mac keyboard.

a z a z a z a z a z a z a z a z a z

Then after a while of getting the whole alphabet mentally mapped to physical locations on the keyboard, begin writing words and simple sentences.

Oh geez I hated the long boring repetitive practicing but, I'm glad I don't have to look at the keyboard to type.

As ridiculous as this answer is, no I don't know of an app for the mac that he can use. There are not a lot of options out there for accessible typing tutor programs for the blind. Talking Typer works for windows and ios, but even it is not very good. My wife works with blind children and technology and she has been trying to get someone to create a better option for this issue.

I also did not learn to type until I lost my sight. I used talking Typer to learn, but I think your dad can learn to type if he is dedicated enough. Does he use VoiceOver, the screen reader that is built into the mac? If so he can set it up to where every time he types a letter or a word it says the letter or word. Once he knows where all of the keys are, the he mainly just needs to build up muscle memory. I'm sorry that I can't help more.

Ironically, I learned to type on an Apple II. I guess you could $1 to run the exact same programs I used, over 20 years ago. However, surely someone will know of a more modern solution. I've heard really good things about $1, but I think that's IOS only. However, if he has access to IOS and a bluetooth keyboard, it's another possability.