It can sit on the server with zillions of other returns until after Jan. 27 when the IRS begins to accept/reject returns.
Your e-filed return is still in pending on the server because the IRS will not begin to accept/reject/process returns until January 27. Only a few returns were accepted early in a test batch. Everyone else has to wait.
https://www.irs.gov/newsroom/irs-opens-2020-filing-season-for-individual-filers-on-jan-27
So watch your emails and spam folder to make sure you know after Jan. 27 if your return was accepted or rejected.