@Electrical_Engr_CDR pwede ka nmn kumuha ahead of time lalo na kung mahirap kumuha ng police clearance sa mga bansang tinirhan mo. Pero hindi advisable na kumuha before the invite.
Yung mga Police Department abroad nanghihingi ng copy ng acknowledgment lettter ng visa application with reference no. After visa lodgement and payment mo pa to makukuha.
From the time of invite hanggang magkaroon ng case officer aabutin din ng around 40-50 days. Eto yung time na pwede mong kumpletuhin ung mga requirements.
May expiration ung mga police clearance. Usually 12 months pero merong 3 mos or 6 mos. So dapat hindi pa expired yung ipapasa mo na police clearance pag ng-upload ka ng documents.
Nakabase din sa expiration ng police clearance and medical exam ung Initial Entry Date (IED). Pag na-grant na ung visa, kung pa-expire na ung police clearance in 6 months, within 6 months kelangan mo mgtravel to Aus for your IED.
Good luck. 🙂