"Hooray for me!"

• Verbal flourish
• Entertainer's word
• "And heeeere it is!"
• ''I did it!''
• "And ... there you have it!"
• "I'm finally done!"
• Shout following a drumroll
• Shout like "Voila!"
• Follower of a wondrous feat

Wiktionary Word definitions in Wiktionary
interj. (alternative spelling of ta-da English)