4080 soon or 5090 later in future?

Hello everyone, I'll try to explain what is concerning me these days.
I have already all parts (9800x3d, 64gb ram, 2+2+4TB ssd/nvme etc...) for a build I'm planning to do for a 5090. In my worst expectations I thought that 5090 would realistically be available up late february/early march, but talking with people working in logistic that like me are waiting for new nvidia gpu's, they were told that at the very best big stocks of 5080 and 5090 will come only by late april in europe with a reasonable accessibility only by summer 🤦🏻‍♂️
now, this is what I've been told, so nothing carved on stone of course, but considering I have a certain urgency to complete the build and finally install the pc in my new apartment, do you think would be wiser
A) wait up to the summer to get a 5090
B) get a 4080 soon and carry on with that until 60xx release?

I don't think MGF will ever be added to 40xx (at least not in official way) but I don't really care of ray tracing since I use PT only for photomode of cyberpunk.
What I'm looking for is to play at 3840x1600 on most recent demanding AAA up to 120fps on dlss4 perf + FG since I'll use this pc on a LG C4. Do you think 4080 is the right choice?
4090 is out of discussion because can't be found anywhere and 2nd hand 4090 are >2000€

Let me know your opinions.
Luckly I can afford a 5090, so please avoid comments like 50xx overpriced, you're not paying for real frames etc... I know already that 5090 is a waste of money anyhow, but I don't think can go on much longer with my 2080ti.