You are already having most of the tests as well as a good history to help me guide you.
is big and needs to be removed. It is most likely a benign one.
The problem with these cysts is that they tend to twist on themselves. Then they become extremely painful and may also bleed inside and damage the adjacent normal ovary. In that case removing them becomes an urgency. So it is best removed while it is still in untwisted state.
The procedure can be easily performed laparoscopically depending upon the skill of the surgeon doing it. Better consult your operating doc for the procedure he is confident with.
Hope this was helpful.
Best of luck for the surgery and have a good day.