Email. I was 6 when my dad typed an email to my grandma and then hit send. I asked when she would get it and he said "oh, it's on her computer right now".

SteamlessTimes (Decky plugin) tracks time in non-Steam games if you add them to your library.

Yes it should work for anything that you add to your library though it hasn't been working for me lately, probably because I'm on the Steam client and Decky betas. I'm not too picky about tracking my playtimes so I haven't really bothered fixing it. Should work though!