To check which incentive level you are at and monitor your progress, you can do so from the banner in the "Find a Job" page.
The medals will light up according to which incentive level you have achieved. You will be shown the bonus amount you will get on every new jobs claimed when you are at that incentive level.
You can click on "More info" for a breakdown of the amount of earnings you have earned in the last 7 days. You will be able to see the bonus you qualify and which incentive level you are currently at.