There's a bit more information here, but not much.   https://www.irs.gov/newsroom/irs-operations-during-covid-19-mission-critical-functions-continue

Seems like the IRS called back the people that handle printing, but there is still a lot of mail to go through per the inspector's report in the last posting.  I've seen a late payment notice received this week via post office mail regarding for a check that was sent in early July, so I'm not about to recommend a stop payment.  Maybe just prior to the due date they make payment again electronically and then sort it out later.