Hi
No, you can't. Apple Watch cannot be used at all (even for telling the time) without being paired to a compatible model of iPhone.
This is required in order to set up and use all models of Apple Watch, including for managing and syncing with the Apple Watch over time:
- Apple Watch Series 3 (GPS + Cellular) requires an iPhone 6 or newer with the latest version of iOS 11.x.
- Apple Watch Series 3 (GPS) and all other Apple Watch models require an iPhone 5s or newer with the latest version of iOS 11.x.
Apple Watch cannot be set up and used on a standalone basis or synced with any other device from Apple or any other manufacturer.
More information:
Set up your Apple Watch - Apple Support