"And.... voila!!!"

• Accompaniment to a drum roll
• Exclamation with a flourish
• ''Check it out!''
• "The feat is complete!"
• "Look how perfectly I performed!"
• "Ain't I wonderful!"
• Self-satisfied exclamation
• [mic drop]
• Unveiling exclamation

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