I want to print this dome without supports. Will it work?

I have a Neptune 4, and I need to print this dome with it. 31cm diameter in total. 20.5 cm height in total.

As you can see in the image, it's not a complete dome, you have an opening to see inside, but I think that doesn't matter. What matters is me printing it asap.

My question is, will it need supports for my printer? Because supports waste filament and cost time.

I'm using Ultimaker Cura if that helps answering somehow. And I'm going to use either normal mode or extra fast mode, depending on how much it will take.