My MBA M1 connects to my wifi6 router with a Tx-Rate of 1.200Mbit/s.
Speedtests show around 850 Mbit/s.
When using my USB-C ethernet adapter (Anker 2.5Gb adapter), i get about 940 Mbit/s, which is close to the theoretical maximum in my 1GB home network.
I'm also using a 1Gb internet connection.
On my TP-Link AX-50 (Wifi 6), I've gotten as high as 240 Mbps both up and down, using our Fios service. I'm only paying for 200/200, so this is very much in line with what I'd expect. Tends to drop off a little at the other end of the apartment.