Well, there is a free, simple and easy way you can check yourself:
1. Create a myIR account.
Make sure the address in the bar at the top starts with https://www2.e-services.ird.govt.nz. This is to make sure you haven't ended up at a fake website. There should also be a little padlock showing in the title bar at one end.
Generally you will be wanting to find out how the processing of your personal tax return is going, so choose this option (see graphic)