Ask Siri for Help
As long as you have a cellular data or Wi-Fi connection on your Apple Watch, you can use Siri to do just about anything you normally could with your iPhone nearby. This includes starting timers, opening apps, making phone calls, getting directions, and even searching Google.
Sadly, even though iOS 15 introduced the ability to use some basic Siri functions while offline, this hasn’t yet been extended to watchOS, so you will need some kind of internet connection to perform even the most basic functions like opening apps and settings timers.