Once your return is accepted, TurboTax does not get any information about when you will receive your refund. The IRS is the only one that would know when you will receive your refund. Currently the IRS is not processing any mailed in returns, they will process mailed in returns once they re-open. I am not sure of the exact date they stopped processing mailed in returns.
Have you checked the IRS website Where's My Refund? The website updates once a day.
https://www.irs.gov/refunds
