Do not wait for anything from the embassy for the Philippines. You will not get anything except possibly an email saying your case is ready. Everything there is driven by you. Once the DS-160 payment receipt is valid (24-36 hours), you can start looking for an interview appointment. Once you have the interview date, schedule medical exam for about a week prior to interview. I-129f approval evidence is the NOA2 from USCIS. It will say "Approval Notice" in the block to the right of the address block. Below that, the first sentence in the text will say "The above petition has been approved."
This is not "cheating the system." It is the normal and correct way to do things in the Philippines. The packet others speak of generally never arrives from USEM, and even if it does, it will be months after you have completed the process. It is not expected for you to wait for it, and it is not required at any point for you to complete the process.