This article follows the articles for end users and super users in relation meeting transcription.
Transcription is available to all users with Microsoft 365 E3, Microsoft 365 E5, Microsoft 365 Business Standard, and Microsoft 365 Business Premium SKUs.
Transcription is off by default in the Global Meeting Policy and so your users will not see the feature unless you enable it.
As transcription is a feature which is policy controlled, it can be on for some users and off for others, by use of multiple policies.

See guidance on meeting transcription settings https://docs.microsoft.com/en-us/microsoftteams/cloud-recording#turn-on-or-turn-off-recording-transcription and managing meeting policies https://docs.microsoft.com/en-us/microsoftteams/meeting-policies-in-teams