I put zero thought whatsoever into "curriculum" for my toddlers. I played with them, talked about colors, read to them, got them outside as much as possible. We had two working parents so they were in daycare during the day, until 6pm every night.
One is now finishing their junior year in high school with Eagle Scout, 3.8 GPA without weighting, and a 1540 SAT. The other is in middle school with straight As and 2 years ahead in math. They are doing fine, academically and socially and mentally.
Your kids will be who they are. They might love academics, they might love something else. Use this time to help them explore, not to direct. If there is spare time, use it to read to them. That is more valuable than anything.