Larger aspect tires are not recommended by tire experts. The MAXIMUM recommended increase in diameter is 3%, which is maybe 1/4" on the model 3. A larger tire will throw all UI software in disarray with respect to speed, distance, calculated range, etc. This MIGHT void your warranty if any damage is done to any aspect of the car as a result of rims or tires larger than OEM. Just a reminder, the outside diameter of the 18" and 19" wheels (rim plus tire) are virtually the same as a result of skinnier tires on the 19" rims.
What I am looking for are fender flares, similar to the Model X, that will close the fender gap on the existing wheels.