Yes apply on the same day as long as your documents are in order. In fact I’d recommend it , since some country’s have limited stays ( 30 days) some people have been know to have extended processing times of extra docs are required
Sydney was easy enough for me. It really depends on your situation. I flew back to Aus to do mine just because of having all Aussie documents ( bank , license etc) I figured it would be more effective giving it to an Australian consulate since they would be familiar with our documents 👌
bro holding cell is not prison, he literally flew in on a tourist visa a they refused him entry. That can happen to any one of us on any visa. A visa or visa exempt is not a