From https://www.mediawiki.org/wiki/Outreach_programs/Life_of_a_successful_project#Reporting

Reporting is very important for the followers of your project, your mentors, and yourself. Investing a few minutes reporting on a weekly basis will save you a lot of time and energy.

For the weekly reports, please create a Phabricator task and associate it with your project. Insert a table with the date and report columns in which you'll write your weekly report. Write your reports as telegrams, always linking to the areas of progress: tasks, patches, demos, documentation pages etc. It is better to deliver short or even incomplete reports on a weekly basis than trying to elaborate the best deep weekly report but then get stuck and not deliver it at all. Two good examples of weekly reports can be found at

Let me pull in some samples: T100997