It's about $7 at the moment to be included in the next block. A new block is added approximately every 10 minutes. Since bitcoin does not guarantee finality some services require you to wait for a certain amount of extra blocks after yours to reduce the chance of a change reorginaztion happening that doesn't include your transaction.
Bitcoin will not function as a currency due to it's high volatility. For a more usable currency look at DAI, USDT, and USDC which are stable coins pegged to the dollar. DAI is collateralized with on chain assets where USDT and USDC are collateralized with real life assets which are mainly regular USD.