If you're the host, you can get a transcript of the meeting or webinar if you record the meeting in the cloud. The transcript will be available on your Webex site after the meeting or webinar. You can play audio clips of the transcript, download it, make edits, and share it with others.
Webex Assistant is available in Webex Meetings.
Beginning with the 41.5 update, it is also available in Webex Events (new) webinar mode.
In addition to Webex Meetings and Webex Events (new), with the 41.7 update, Webex Assistant is also available for the Webex app. Meetings started or joined from a space don't support Webex Assistant.
Record the meeting or webinar 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.