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At what time of the day is GOG updating its shop and main page?
It used to be midday (at least in France), but I'm not sure it still is anymore...

Same time, GOG recently redesigned their website.

The front page is a mess atm. A lot of the info I'm used to getting there is no longer possible or requires digging.

A useful forum post is trying to keep track of the daily deals, HERE

The week-long deal was posted, on Monday, on the news section, but currently the post can't be accessed because it got buried by other news posts.

People are trying to figure out if there is a weekend deal, HERE

EDIT: Update: Weekend deal seems to be delayed by 4 hours according to the daily deals forum post.

They use Warsaw's local time, and they have DST.
Today's announcement for Weekend Sale delayed for 4 hours, compared with their normal updating time.

Thanks both of you, very helpful :)