This is by far the most common way to get up to a top catcher.
Turn around on the bar. At the frontend, start to bring your body up as if going into a Reverse Uprise position but before bringing your hips onto the bar, look up, let go and give your hands to the top catcher.
You can find out more about this trick in my books:
Thanks to Fred and the team at Circus Arts Australia for providing videos for this page.