I mean, the planet is likely smoother than a lot of ball bearings
The highest point and the lowest point aren’t very far deviated. Less than 6 miles up and less than 6 miles down. Basically a little less than 0.001% deviation.
Edit: After doing a bit of digging it looks like Earth would be comparable to a 1 inch grade 1000 ball bearing. Grade 1000 are not remotely close to the highest grade, in fact it’s one of the lowest grades of ball bearings.