Apple bringing double-tap gesturing to its WatchOS 10.1 today, which means you can use it on the Series 9 and Ultra 2 watches.
Double Tap Gesturing Comes to Apple Series 9 and Ultra 2 Watches
Apple bringing double-tap gesturing to its WatchOS 10.1 today, which means you can use it on the Series 9 and Ultra 2 watches.