That's a great use for it! The pine shavings take a while to break down too, but the poop will help.
Chicken poop needs to sit for a few months to "age," so now is a good time to put it on the garden and let it sit all winter. Another option is to make a "hot" compost pile that breaks down in a few weeks, not months. Google "berkeley hot compost method" for lots of information. One caveat: it's a lot of physical labor, because you have to turn it regularly.
Here's a good link:
https://deepgreenpermaculture.com/diy-instructions/hot-compost-composting-in-18-days/
Where are you located? You can add your location to your profile, and then it's always there. When it comes to chickens -- and gardens -- location and climate make a difference in the advice you'll get.
And, welcome to BYC!