I'm certainly not the best for answering this, but after some research, I can say this:
Guru3D (https://www.guru3d.com/articles-pages/palit-geforce-rtx-2070-dual-review,7.html) recommends a 500-550w PSU to run a RTX 2070. Also check this Toms Hardware review on page 9:
https://www.tomshardware.com/reviews/nvidia-geforce-rtx-2070-founders-edition,5851-9.html
So technically, yes, it would be fine. However (I'm sure some of you others may support me in saying this) a larger PSU would probably be better in terms of future-proofing in the chance that you may want to overclock.
At the current price of an RTX card, (the cheapest one near me going for $750 AUD) I would certainly get a higher watt PSU, so your system doesn't stuff up in the future. Go for a SeaSonic. I've only ever had Corsair (becasue they don't sell SeaSonic near me) but absolutely EVERYONE on this forum will tell you that SeaSonic make the best power supplies.
The power supply is the one thing in your PC that you DO NOT want to skimp on.
Get a good one. That $25-30 extra you spend on a good PSU could mean the difference between your rig stuffing up or not.
Also, please list you full system specs, which country you're in and whether you'd like to shop in stores near to you, or online stores.
Mods - if i've said anything wrong in this post, please correct me.
Cheers