The 3060ti is a huge jump in graphics capability.
Kudos for buying a top end psu up front.
You will have no problem with power.
Trust your son to know what he needs.
I say go for it.
Yes, new stuff is coming, and likely will bring about a 15% bump in price performance. But, new cards will be launched first at the highest(expensive) performance levels and will be in short supply.
Possibly, intel discrete graphics cards will compete.
If you wait for the next best thing, you will wait forever.
The 11400 processor is a capable gamer.
But, one thing you might do is to run this simple test:
Run HIS games, but lower their resolution and eye candy.
This makes the graphics card loaf a bit.
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.