After you file

It looks like we're all in the same boat more or less.  I mailed my paper 1040 on March 15, 2021 and they still have no information available via the "check my refund" tool.  I received my State refund (CA) within three weeks.  Since Calif received & processed my paper return, isn't it a safe bet that the IRS did receive my 1040?  I can't get ahold of any live person at the IRS, I've tried every which way.  It sounds like they're very behind.  All the posts are saying people haven't received their refunds - Has anyone received their refund I wonder?

I'm glad this forum is here, at least I know I'm not alone.