Your e-filed return is still in pending on the server because the IRS is currently accepting/rejecting/processing returns. Sometimes it can take more than 48 hours to process. Only a few returns were accepted early in a test batch. Everyone else has been waiting. Please see the TurboTax FAQ below for more information on pending returns:
https://ttlc.intuit.com/community/return-status/help/what-does-pending-mean/00/26331