The Hong Kong police will send it directly to the US embassy in Manila, unfortunately, you will not get a notification from either USEM or the Hong Kong police that it has been sent. However, you can reach out directly to the Hong Kong police and ask for a status. Our document was dropped off by our friend on 8/11/2021 and when I emailed HK police they confirmed that they sent the clearance to USEM on 8/25/2021.
Here's the email I used ts-cncc-ib@police.gov.hk but I also see this one:cncc-enquiries@police.gov.hk , which is probably the updated one. Make sure to provide the information below when you're emailing them.
1) full name in English (SURNAME, given name)
2) HKID number (if applicable)
3) valid passport number
4) date of submission of application documents/our CNCC application number for your application