I just bought cyberpunk 2077 and I cant find the goodies anywhere. When I open the "Games" tab it only shows the main game. I openning it on firefox, but I tried the gog windows application too.

"the giveaway is time-limited and lasts on GOG.COM only until 4th July 2020, 5 PM UTC!"
source: https://www.gog.com/news/grab_your_free_digital_goodies_from_cyberpunk_2077

You're too late.

If it's on the account, time limited or not, it should be downloadable

When exactly have you bought the game? If you bought it after the time mentioned above they are not on your account.

go on the website, klick on your account name and you should see it. then you can download them all, or just what you want.

Cyberpunk 2077 does/did not have to be purchased via GOG in order to download the "Goodies".

I purchased a boxed copy via a certain online retailer, and thus have no game associated with my GOG account, and yet was able to redeem the offer.

Ah, true. Thought you already can get some goodies when ordering it on GOG. Wrong question I asked then. Then we'd just need to know what he tried to look on the website.

I suspect that he either initially assumed that the extras on offer would automatically be included with the game, or checked his account immediately after redemption and failed to find anything.

I at first wondered if the extras would not be added to my account until I add the game, as they did not show up right away. I have no idea how long the delay ended up being.