Looking for a waterproof electrical bicycle, is there such thing as ip68 for electrical bicycle?
None of the name brand e-Bike motor manufacturers makes a motor intended for use in a bicycle that is also rated for continuous immersion in water.  (IP67 is a rating that it works when completely underwater, not that it is rain resistant....)
Some manufacturers do claim an IP65/6 splash resistance rating, particularly for hub motors.
Mid-drive motors are a little trickier since they are just a component that gets integrated into a frame by the builder and the manufacturer doesn't necessarily control the final product you get.  None of the three big brand names in pedelec mid-drives claim a specific IP rating for just the motor unit.  However, they have certainly all proven fine to ride in the rain in practical experience!  (Best to not leave parked outside in the rain with water pooling on components though.)