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
If accepted by the IRS use the federal tax refund website to check the refund status - https://www.irs.gov/refunds
See this IRS website for federal tax refund FAQ's - https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions