Yes it is launch day tomorrow, but usually for Apple product launches, reviewers release reviews (at the same time, under embargo) prior to launch day. Hence the speculation in this thread.
But usually, those product launches are updates to existing hardware (i.e., new iPads, iPhones, spec bumps for the Mac lineup), not a completely new machine. There is also a lot of trepidation regarding these new Macs, with many longtime Mac customers saying they will wait to order a new Mac because of how many unanswered questions there are about the M1 and these new Macs. This is far different from a new iPhone or traditional (Intel) Mac update, because Apple is making a transition akin to the PowerPC - Intel switch, where the underlying code base and OS are separate from the Intel-based machines most of us are currently using (there are some reviewers and Apple Developers using the DTK who are already using Apple Silicon based Macs on a daily basis, but that is by far a small sliver of the userbase).