So for example, I want to enable my contract 1 week after deployment, thats now() + 1 week, how could I know which block that will be so I can send my clients a countdown to that block with https://bscscan.com/block/countdown/9999999
We built a little tool for this last year called BlockBucket:
It works by using the average block times and figuring out how many blocks it will take to get to that time. We've built it to work for most EVM chains (including BSC).
Hopefully this should do the trick?
Let me know if you have any questions :)