Answer:
The Waterfall methodology is a sequential project management approach, where stakeholder and customer requirements are gathered at the beginning of the project, and then a sequential project plan is created to accommodate those requirements. Each phase of the project cascades into the next, following steadily downward like a waterfall.
However, I couldn’t find specific information about when exactly during the Waterfall phases the project manager brings the full team on board and orients them to the project and expectations. It may vary depending on the specific project and team.