Just 8% of Bitcoin is already mined from 2009 till date
Did you really mean 8% or It was a typing error?
which is a clear picture that we all wouldn't be alive to witness the last mining block of Bitcoin
By the way, if the last Bitcoin block reward was issued, It doesn't mean that would be the last block to be mined on the Bitcoin network. Confirmation of blocks would continue only that miners would rely on the total transaction fees for all transaction in each mined block as incentives to them for mining
OP read this:
https://www.investopedia.com/tech/what-happens-bitcoin-after-21-million-mined/