I installed the developer beta. I don't see how to show topographic maps.
How do I show topographic maps?
There's no supported way for you to display topographic maps in your app through MapKit with the APIs currently available. If you'd like us to consider adding the necessary functionality, please file an enhancement request using Feedback Assistant. Once you file the request, please post the FB number here.
If you're not familiar with how to file enhancement requests, take a look at Bug Reporting: How and Why?