The price of the cryptocurrency at the time of clicking either "Buy" or "Sell" is what you will purchase the crypto at. The cryptocurrency market is constantly fluctuating, hence there is no one price that will be offered at the time of purchase.
Your purchase or sell price is locked in during the transaction, that way you are aware of the price at which your cryptocurrency is either bought or sold.
You can view all your transaction processes for each wallet when you open the wallet.
Remember that the price of any cryptocurrency is dependent on supply and demand.