Ask HN: Speech to Text Journal App

It occured to me that my drive home would be an excellent time to be able to record a journal of the days activities. I would love to see a transcription of what I said in my Onedrive, or some journalling application on my laptop when I got home. I suppose this is the equivalent of speaking into a dictaphone and giving it to my PA in the morning, except I have neither a PA nor a dictaphone! Does this exist in the market already?

Otherwise lets discuss the architecture of potential software solutions!