In my area (Inland PNW) it seems all USPS packages go through Seattle.
About 1 1/2 weeks ago, they had a package I'd shipped for several days, not the usual deal for sure.
Seattle being hit pretty hard with the virus, I figured that was likely the issue.
The buyer was kinda hopping up & down for a few days, but did receive the package.
Junk mail & bills appear unaffected !

Anything I sell, I'll advise the buyer that even shipping is affected.
In your case, maybe something on your home page or however the process works, can save you some grief.
You've probably already thought of that, though.

Some people are gonna be pretty crabby, being cooped up, inconvenienced, & waiting on basically everything.