Record the meeting to get a post-meeting transcript.
See Interact During Webex Meetings from a Mobile Device for more info on recording meetings on a mobile device.
Get a Post-Meeting Transcript by Recording Your Cisco Webex Meeting
If you're the host, you can get a transcript of the meeting if you record the meeting in the cloud. The transcript will be available on your Webex site after the meeting. You can play audio clips of the transcript, download it, make edits, and share it with others.