Hi @loopdubs you're not missing anything, it is either that the customisable clocks you've seen in press/youtube videos etc are only available as part of the Pixel OS. If these custom clocks are part of AOSP now or pushed at a future date, be sure they will eventually find their way onto GrapheneOS. Aesthetic additions not essential to getting a prompt update out for security/privacy reasons such as maintaining the cutting edge patch levels always take priority.
Just keep your eye on release notes for now and across our channels for further info.