

If your wireless network does not support Wi-Fi 6, Wi-Fi 6 support in a client will have no bearing on the performance and functionality the client gets on the network. Only if you use a wireless access point (usually a router) with Wi-Fi 6 certification / support for 802.11ax, will you have a Wi-Fi 6 network. However, this support is only relevant when you also have a wireless network that supports the standard. The very first Wi-Fi 6 products hit the markets around the end of 2018 / early 2019, and the latest high-end products, such as smartphones, now support Wi-Fi 6.
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You can read more about what the standard entails here: Wifi 6: What can we expect from 802.11ax and the designation Wi-Fi 6 itself here: Wi-Fi 6, 5, 4. Wi-Fi 6 is often referred to as "high-efficiency wireless", boasting increased capacities, improved resource utilization and higher throughput speeds.
