Buy a laptop on Black Friday?

I wanted to put a laptop at home for my home that my mother parents can surf from the living room. Is it worth waiting for Black Friday in 4 weeks or won't everything be cheaper there?

Nothing gets cheaper there. The things that are "discounted" are now slowly becoming more expensive. And if you are then happy about a 20% discount… The thing has already become 25% more expensive than now (as an example). Interestingly enough, there's even a study for the oh-so-great Black Friday that confirms what some have known for a number of years (if you just keep an eye on the prices):

https://www.computerbase.de/2020-10/studie-black-friday-deals/