Then that is a very good fit
You've already got that monitor I take it? How did you find it out of curiosity?
Re the PSU, not all RTX 2070 Supers use the same amount of power. Many are factory overclocked and so can use more power under heavy loads:
The Galax RTX 2070 Super HOF 10 Year comes with a large overclock on both GPU and memory, it's actually the fastest RTX 2070 we have ever tested, almost matching the RTX 2080. Thanks to a large power limit increase and 16 Gbps memory chips from Samsung, manual overclocking works great, too.
So it depends a little which 2070 Super specifically you buy.
Also, a VS series is fine as a budget PSU, but is not the most efficient. Also running PSUs closer to their limits can be even less efficient and result in more heat. The and 'quality' of the power they provide to the components is not as good either.
Therefore, even if you technically could run your specific 2070 Super off the 450W VS, there'd be an argument to upgrading, not just to a higher wattage PSU but - since you're upgrading anyway - to a better quality unit too. e.g. Corsair TXm, Corsair RMx, Seasonic Focus / Focus Gold, and so on.