Since the Galaxy Fold 2 is unlikely to have a waterfall screen, it is possible that Samsung may use this design for the Galaxy Note 20. However, there is no evidence available yet to prove that the design described in the patent will actually be used for a phone this year, let alone the Note 20 series.
Currently, the only smartphones with a waterfall screen are the Huawei Mate 30 Pro. and Vivo NEX 3. Chinese smartphone maker OPPO is also working on a phone with such a screen. It was actually the first smartphone maker to showcase the display technology last year.