As others have stated, unfortunately Intel changes the motherboard every two generations on average (sometimes every generation) and usually on average only offer 2 generations of forward/backward compatibility.
So you'll need a Z390 for the 9900K or the 9700K.
And as for the CM1000SP that was a really good PSU back in it's day, but depending on how much usage it's seen and how long it's been since it was first ever used you might be running a risk with it dying on you sooner than later.
But from an initial stand point and the specs of it, it's more than enough for both those CPU's and the GPU you mentioned, but like I said, it could fail you at any moment if it's seen too much usage after all this time.
So an answer to the questions about the PSU would help us to determine if it's worth still using.
(but chances are it is)
Also will need DDR4 memory.
The cheapest 16GB (2x8GB) kit of DDR4 in the US goes for $62.99 online retail right now.
--UPDATE--
Just saw your post, 6-7 years is a pretty good amount of time, but depends on how much usage it's seen and how much load on average was being put on it over the years at any given time.
Chances are though it's fine and you can continue to use it.