Sometimes it takes a few days for tracking status to be updated. I have a few orders, one was shipped on 31 Aug and its tracking status is available on the China Post website. But a couple of orders that were shipped before 31 Aug have no tracking status.
Also make sure you are checking on the right website. If your tracking number ends with CN, it's tracking status will appear on China Post website, but if it ends with HK (Hongkong) or MY (Malaysia) then you need to check in the relevant country's website. I had a package that was stated as shipped via China Post but the tracking number showed it was shipped via Malaysian Post.
Some FAQs about China Post are here
FAQ on China Postal Service
If the package has left the country of origin then you need to track it on Pakistan Post website.
https://ep.gov.pk/track.asp
Another useful site for tracking mail is below. It can track mail from 124 countries.
Post/EMS tracking - track-trace