The answer is yes, it is possible. The catch is that iFixit doesn't have parts on the shelf or guides up just yet, but I'd be willing to bet that there's an empty box on the shelf waiting to be filled. Keep checking back at this page for updates:
https://www.ifixit.com/Store/Parts/Apple-Watch-Series-3-GPS.
The confirmation is in the [guide|97521|teardown]:
"Screen replacements are difficult but do-able—it's the first thing to come off, and detaches via simple ZIF connectors."
If you just can't wait to have a shiny new screen, [https://support.apple.com/watch/repair/service/pricing|here's] the Apple page.
You got this!