Hello, Yo C.
I would suggest you to say: "That's all for now.", or simply "That's all." If you want to sound more polite just say: "Thank you for your attention." Remember that a formal or academic presentation is very different than an informal conversation. Also do not try to translate everything word by word. That is translation ad verbum (translating only the words) and you need to learn translation ad sensum (translating the message, not the words).
I hope this helps.