Go to the navigation bar at the bottom, click on "Account", and it will show your progress in the different incentive levels.
Click on Job Incentive arrow ">" to track your earnings progress for the past 7 days. You will be able to see your current incentive level and your total earnings in the past 7 days.
When you complete more jobs and have higher earnings, you will reach the next higher incentive level. You will receive a pop up as shown below to inform you the new incentive level you have reached.