https://support.apple.com/en-au/guide/ipad/ipad9a2465f9/ipados
Dictation
To enable Dictation on an iPad:
- Click Settings > General > Keyboard.
- Turn on Enable Dictation.
To use Dictation on the iPad:
- Click on the microphone key on the keyboard.
- Click on the keyboard key to stop dictation.
NOTE: This will also work on your iPhone and iPod.