Hello @Ben Mollo
According to Microsoft, it's scheduled to start being delivered at the end of this month (April 2021).
This is the latest message shared by them:
We are excited to announce the forthcoming availability of Teams webinar capabilities, beginning rollout at the end of April 2021, completing in May 2021.
Associated features that apply to webinars and meetings, include:
Registration page creation with email confirmation for registrants.
Reporting for registration and attendance.
These capabilities will be available to users with the following licenses: Office 365 or Microsoft 365 E3/E5/A3/A5/Business Standard/Business Premium. For the rest of 2021, we are offering temporary availability to Teams users to try the features with their existing commercial subscription.
You can also follow up on the Microsoft 365 Roadmap:
https://www.microsoft.com/microsoft-365/roadmap?rtc=1%26filters=&searchterms=80099
Hope this helps.