How to retrieve quality settings of a specified QualityLevel?

I'm creating a config menu for my game and currently working on a slider which will set quality settings depending on what the player sets it to (but it won't apply these settings until they click an Apply button, I want it to just update the UI elements to display the new quality values).

To do this, I need to access the quality level which the user switches to but there doesn't seem to be a way to retrieve these values before the new quality level is applied?

Edit: Forgot to mention, I'm using c#. This is in a script which gets called when the slider value updates.