You are likely ok.
Your psu has the requisite 6 and 8 pin aux graphics connectors.
Just do not buy one of the highly overclocked versions of the rtx2080 super that needs two 8 pin connectors.
Together, with the pcie slot, that amounts to 300w.
The i7-8700 is a 65w tdp processor that will not be overclocked.
Your psu is not one of the evga best units so far as I can tell, but it should still be safe to run.
What is your current graphics card?
What is your motherboard?
What kinds of games do you play?
You could very well be more cpu limited than you think.
Run this test:
Run YOUR games, but lower your resolution and eye candy.
If your FPS increases, it indicates that your cpu is strong enough to drive a better graphics configuration.
If your FPS stays the same, you are likely more cpu limited.