They have just begun to process paper returns that were sent the end of February.  I have a client who sent his return in on February 29th and he actually received his refund today. His return was processed in the Fresno, California office were they have resumed very limited operations.  They are, of course, paying interest if they take over 6 weeks to issue the refund.

This is what the IRS website says regarding the processing of paper returns...

Updated July 2, 2020

The Internal Revenue Service reminds taxpayers and tax professionals to use electronic options to support social distancing and speed the processing of tax returns, refunds and payments.

To protect the public and employees, and in compliance with orders of local health authorities around the country, certain IRS services such as live assistance on telephones, processing paper tax returns and responding to correspondence continue to be extremely limited. While some volunteer tax preparation sites are operating at a reduced capacity, most remain closed until further notice.