It comes out this week on eShop, but stores already have their physical copies on the market and many have been letting people purchase them early to avoid a rush on Friday due to social distancing requirements.
I am able to connect to channel 161 5ghz (5805mhz) with my switch, and i confirmed with my phone that it's 80mhz (5735 - 5815mhz). I get 134 mbps transfer speeds copying files over FTP.
If you live near other people, the lower bands could be very crowded and have a lot of interference. You could certainly see an improvement moving to a "clean" channel.