Pending simply means that your e-filed return is on its way and that the government hasn't accepted or rejected it yet.
Your tax returns will remain Pending until the IRS starts receiving tax returns. It may be several days after the IRS start date before your tax return gets accepted or rejected.
Go to this IRS website for the official start date - https://www.irs.gov/newsroom/irs-opens-2020-filing-season-for-individual-filers-on-jan-27