My dad who is a US citizen filed for my three kid sisters who were below 18 and myself but i was 24 that time in Nov. 2017 in Ghana, my sisters have gotten their greencard visa a longtime but my visa status is F11. so how many years will i need to wait before it come. Also I travel to Australia to further my education this year. In case it comes, do i need to go back to my country to do everything or i can do my interview in Australia.