Literally you see on CMC you get real time update, they fetch data from various exchange with real time buy and sell order making, just see this below
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.postimg.cc%2FGpPY4Kj6%2Fkljatasrui.png&t=663&c=4mDTu4dSvHepsQ)
the updated status shows recently, however if you want to fetch the real time data you can always use their API
or you want more authenticity on the real time data simply fetch data from the exchange itself.