What about my open orders? How and when they will get executed ?

An open order is essentially another investor saying they are willing to buy or sell an asset at a specific price. A trader who executes a spot trading order only needs to specify the value of the asset he would like to buy or sell.

An order may remain open when an investor places conditions on their transaction, such as a price minimum. If the condition is not met (e.g. the crypto price has not yet reached the minimum amount requested by the investor), the order remains "open."  

The orders which can be seen in the open books are open orders and are on process 24/7 in BuyUcoin. They get executed once a buyer or seller approaches the particular price the buy or sell order is placed for.