Some resources that could help y’all think and prioritize and estimate

Checklist and Cost Estimation:

Checklist Design
A collection of the best design practices.

UX Recipe (estimation tool) (main page:

Statement of work and Project charter guidance

Example of Statement of Work template

An example of a UX SOW

Project Management and Planning

Project Management for User Research: The Plan — NNGroup

How to Create a UX Project Plan — Medium