For terminal voice input, I think Mac standard dictation is enough to start.
You do not need to build a complicated setup first.
Start with the built-in tool
The Mac already has dictation.
If the goal is to get rough commands or instructions into text faster, that is a good first step.
Use voice for intent, not exactness
Voice input is good for explaining what you want.
For exact paths, flags, and commands, typing is still safer.
The best split
Speak the rough request.
Then review the text before running anything.
That simple habit gives you speed without losing control.
Original Japanese Article
This article is based on the Japanese post: ターミナルの音声入力はこれでOK。まずはMac標準で十分だった.