No AppleTVs nor iPhones have 6E. Only 2023 Macs and the lastest-generation iPad Pros.
Since 1Gbps is the fastest available, the scenarios where you'd see/use the faster speeds of 6E (vs. what you have today) seem rare or non-existent.
Wi-Fi 6E uses the 6GHz wireless band to enable faster and more reliable wireless connections on supported devices. Here’s how to get the best wireless performance when using Wi-Fi 6E with an Apple device.
support.apple.com