Alright guys, I think that there has been a lot of confusion here. Let’s sum it up using info we’ve learnt from others:
The standard decent rate for aircraft in general is from -500-4000 ftm. Logically, the decent rate varies from aircraft to aircraft.
Wide body: -500- 3500fpm.
These numbers are according to a standard-on time decent with no issues. As said by @EyesSkyward below; much higher decent rates are possible.
Despite taking a look at so many sources and articles, there weren’t many sources to prove that decent rates up to 4000 for wide-body are normal. They’re possible and happen, however they’re not found in every flight.
The OP’s question has been kindly answered by me, @EyesSkyward and @Lud_d.