While wearing this cloak, you can take a Magic action to turn the cloak into a pair of wings on your back. The wings lasts for 1 hour or until you end the effect early as a Magic action. The wings give you a Fly Speed of 60 feet. If you are aloft when the wings disappear, you fall. When the wings disappear, you can’t use them again for 1d12 hours.
RollQuest summary Magic action: the cloak becomes wings giving a Fly Speed of 60 ft for 1 hour, or until you end it early as a Magic action. Once they disappear you can’t use them again for 1d12 hours.
RollQuest ships the D&D 2024 SRD as a content pack, on a 5e character sheet that does the maths - roll from the sheet and let the numbers work themselves out. Free to start.