Structure.Gantt allows you to configure how progress for individual tasks and groups is calculated.
By default, progress is calculated using the same settings as Work Estimates. In this case, progress will be calculated based on the values (Time Tracking, Story Points, etc.) you selected in the Work Estimates section.
If you prefer, you can specify a different field from Work Estimates or use a Formula for progress calculation.
While using Time Tracking, tasks with non-empty resolutions are treated as 100% complete.
If using a Formula, it should return values from 0 to 100. All values higher than 100 will be treated as 100.