First of all, China’s patent system applies to the first-to-file system, and whoever applies first will get the patent.
Your paper has not yet been published, has not been made public, does not belong to public technology, and meets the novelty requirements.
You can find a reliable agency to help you apply before the 23rd. , no problem. The 23 mentioned here is the date when the Patent Office of the State Intellectual Property Office received the document. The time may be tight, so you have to hurry up. If the journal publishes it, you cannot apply for a patent.
When looking for an agency, look for a qualified one. Don’t look for individuals who are trying to be cheap and easily deceived. Good luck .