You can see your tips in the ride history in the app. Information on tips received is also available in balance, monthly tax and orders CSV reports which you can find in the Driver Portal.
If a rider gives you a tip, you will get a push notification about it.
Please note that riders can still tip you in cash, but this information will not be shown in the app. You can only see in-app tips in the app that will be added to your balance and included in the payout.