So far, more than 17,800,000 bitcoins (that is, 85%) have been mined, and about 3 million bitcoins remain to be mined; according to estimates, Satoshi Nakamoto owns 1 million bitcoins (5% of the total bitcoins in the network)
Just as Upgrade just said, the current total amount of BTC in supply is 19,500,637 BTC (i.e according to Coinmarketcap), and the value increases everyday, which means that the amount of BItcoin in supply today might be different from what will be in supply tomorrow and the next.