How can I ensure that my product gets featured in the initial hours of its launch?

Split up your responsibilities so you can get maximum momentum in the first hour. One cofounder working Linkedin, another focusing on all the other channels (email, telegram, etc), and the third responding to questions and comments on Product Hunt.

Hi! Great to connect with you! I'm Tao, cofounder and CEO behind MindOS. We're launching MindOS Memory Twin this Sunday! 🚀 I would greatly appreciate it if you could stay notified and support us on the launch day: https://producthunt.com/products.... Thank you so much! Best regards, Tao

You could also reach out to the Product Hunt support team for this. I've had excellent conversations and received helpful assistance from them.

we will soon share our launch experience 🙌 and shortly, engaging our product community before hand to support us in the early hours helped us alot!

right, we always take care of time, because it always matters

Be fast! Really fast! Don't waste the first minutes!