I had two Google Meets; first one was with the Engineering Manager (similar to a PM) with the team I would work with (Heroku), and the second one was with an Software Engineer who would work as a mentor for interns, and would be my mentor if I was given an offer.
Both were, simply put, "technical conversations" where I would discuss my work experiences, projects, and resume, and I would also ask questions about what they did and the specifics about their projects with the Heroku team. The discussions were very in depth of their projects, and if I recall correctly, I had to sign an NDA before hand. Both Google Meets lasted at least an hour.