If your return contained Earned Income Tax Credit (EIC) and/or Additional Child Tax Credit, this is most likely the reason you are seeing Tax Topic 152 on Where's My Refund? site. Tax Topic 152 is basically an informational message from the IRS, letting you know that they are processing your Tax Return. Once the IRS has finished processing your Tax Return successfully, they will update your status to "approved" and will add an estimated direct deposit to WMR.
Please see the TurboTax FAQ's below for more information.
Some 2018 federal refunds will be delayed due to the PATH Act
Why do some refunds take longer than others?