Yes, you can add tickets to Apple Wallet by clicking 'My Tickets' in the menu on the app. Then find your order, and click through to view your barcodes.
At the bottom of the screen, you will see an 'Add to Wallet' button which will add the ticket to your wallet. You need to do this for each individual ticket you've ordered.
Some tickets don't yet utilise barcoded entry and these tickets won't display the button. We're working with all our event promoters to switch them to using barcoded entry as quickly as possible.