That was quite a journey. If it's any consolation, the process has become shorter, simpler, and less error prone as Xcode has developed as an Integrated Development Environment, and iTunes Connect and the Member Center have been tweaked and made more intuitive.
But that was the final step to getting your app released and the next chapter will deal with some of the things you'll need to consider post-release, as well as looking at the many ways there are to go from the point you have now reached.
You have now successfully planned, developed, and tested an Apple Watch app and submitted it to Apple's App Store.
Congratulations again for making it this far!
The next chapter will equip you with the tools and resources you are likely to need moving ...