If you apply for a patent for invention, you can claim the right of temporary protection after the invention is disclosed. However, the coercive power of this temporary protection right is very poor, and you can't claim the right strongly before you get the authorization.
If you apply for a patent for utility model, you can exclude imitators only after the authorization is announced.
You can try to write on the product packaging: "This product has been patented, and counterfeiting must be corrected", which can only scare people.