Other than a few token deals, actual Black Friday/Cyber Monday really isn't a thing for online shopping. It's more accurately Black Friday week, as most sales seem to occur the previous weekend or Monday and persist till "Cyber Monday". Nobody wants to chance their competitors having a "good enough" sale to wait till those specific dates.
As far as I'm concerned cyber monday is pretty much defunct. It was a thing because people would wait till Monday when they could order things over their work's speedy/reliable internet. Now home connections are a lot faster and more reliable than they were 2 decade ago, so no reason to wait.