Does the OP mean that the car has been sitting on jack stands under each of the proper jacking points, or jack stands further along the underside of the car? If the jack stands were under the jack points, and using something to ensure the contact point was only the jack points, then surely that would all be okay? The problem would be in jacking the car back up to switch out the last jack stand on the way up, and the first jack stand on the way down...
Who in the world put a Model 3 on jackstands - supported by the battery....for an extended period of time?
The OP said "stands" That's plural.
hmmm...what in the world happened?