Symbols that are on CBOE BZX exchange (BATS exchange - denoted by .BZ at the end) will be in realtime. Other symbols will have the following delays.
For Stocks: 15 min. with quotes in ET (Eastern Time).
Forex and Futures: 10-15 min quoting in CT (Central Time).
For more information regarding BATS exchange and how to turn on realtime BATS, click on this link: https://www.barchart.com/education/site-features/interactive-charts-bats