Usually, the school notifies the parents through email or message if their registration was accepted. If you still have not heard from the school or been notified, the most common reason could be that the approval process is still in progress.
Please verify if you have provided all documents (eg: Immunization records etc.) required for the registration to be completed. You can reach out to the school or district for exact answers regarding the registration process and its approval. You can check out the FAQs related to the enrollment process here.