While its now possible to display the Google Calendar directly on the Apple Watch using Apple's design, the Keep to-do list was removed without replacement.

Only a handful of Google apps are available on Apple's smartwatch, but this one should help you stay organized. Are more on the horizon?

Keep is still available for smartwatches running on Google’s own Wear OS platform. That’s unlikely to be of any comfort to Apple Watch users who are disrupted by the removal, however; they will need to wait until Apple brings a native version of the Notes app to watchOS 26 this fall.