You don't need anything else. Activity updates every two weeks, there is a sheet with exact dates, when it happens. https://docs.google.com/spreadsheets/d/12saLhlUoqIdairxzuSPu6EYGrt7FN2lOstO1yDjCEbA/edit#gid=1012758442

Activity starts to count after your first post, and your first post was on July 12th, which is 2 cycles.

TL:DR your rank and activity increases from September 1st. (7/31/2018 20:46:40)