Sometimes it takes longer than 48 hours. Here is more information about pending returns:
It can take anywhere from a few days to 3 weeks to update. Until the IRS starts processing it on their own, you may not find record of it or the website may say that you have put in incorrect information when tracking your federal refund. As your return moves through the system, the status of it will be updated accordingly. Taxpayers who claim the Earned Income Tax Credit (EITC) or the Additional Child Tax Credit (ACTC) may experience a delay in processing until mid February. Continue checking the Where’s My Federal Refund? tool for updates. Updates are made daily, usually overnight. You may also download the IRS2Go app to check your Federal refund status.You can track the status of your state return by following the directions in the following TurboTax FAQ.
https://ttlc.intuit.com/community/refund-status/help/how-do-i-track-my-state-refund/00/25571
Note: You will need your social security number, filing status, and refund amount in order to track your Federal refund.