The TurboTax online account will continue to show Ready to Mail since the software has no way to know when or even if the tax return was ever printed and mailed.
The IRS is not processing paper tax returns at this time.
See this IRS website - https://www.irs.gov/newsroom/irs-operations-during-covid-19-mission-critical-functions-continue
The IRS is not currently able to process individual paper tax returns. If you already have filed via paper but it has not yet been processed, do not file a second tax return or write to the IRS to inquire about the status of your return or your Economic Impact Payment. Paper returns will be processed once processing centers are able to reopen.
