You can start the process in the US only (through USCIS) and you can indicate your wife's current address in the UAE.  It first has to clear the USCIS which will take about 3-5 months, after which it will go to the National Visa Center for the consular processing stage.  At that point, there will be an opportunity for you to update your wife's address if she is living in the Philippines at that time.  The entire process will take about 9-12 months.  Please let me know if you have any additional questions or how I can further assist.