Apart from the entry-level iPad, all other models now support Wi-Fi 6.
MostiPad models now support the latest Wi-Fi 6 standard, with only the entry-level iPad still using the older Wi-Fi 5 (formerly known as 802.11ac). However, mobile broadband – referred to as cellular in the US – is an optional extra that costs £120-£150, depending on which model you’re buying.