You will likely need another plant to pollinate it, I am not sure that this species is self-fertile. Try putting some pollen from the anthers onto the stigma with a paintbrush, if a green pod develop you will know seeds are developing...

Google will provide more detail if needed........

The blossom creates seed pods in compartments in the blossom and the compartments open at a later date. I have never grown them from seed so I do not know if the seeds were viable.

The seed pods have a curved bottom and nearly flat top. There are little flaps on the top that open when wet. Look up "Mesemb Seed Pod" and you will find some examples.

1. You need to wait for it's dried out before removing the pod. They can be wiggled and pulled off carefully.
2. Use a drop of water on the flaps to make them open.
3. Put the pod in a small dish of water with a paper towel and use a needle or paperclip to remove the tiny seeds.
4. Lift the paper towel out to capture all the seeds and leave only the water in the bowl.

If you borrow the book "Mesembs of the World" from a local library, there are beautiful illustrations of different seed pods and their structures.