Check out Accessibility Resources for Zoom and MyCourses. This is the NTID Faculty Resources page.
There is a live transcription speech to text built in-app for Zoom.
Go to settings —Go to In Meeting--Advanced. Go to Closed Captioning and check off enable Live Transcription as you see below.
Go to your Zoom meeting you will see this option under closed captions—live transcription—Click on enable live transcription
There is also an Otter speech to text app (both free—limited use and paid versions) built for Zoom.