From the day game becames available from around 5:00 PM CET (4:00 PM GMT) you should see games for current month.
To download them:
Turn on your console: PlayStation 4, PlayStation Vita or PlayStation 3, go to PlayStation Store and then Choose PlayStation Plus / Instant Game Collection.
Add games to cart, go to checkout (should display 0,00 for all) and proceed with your free checkout.
You can also add games using web browser (for every console, even for those you don't yet own) and download them later as long as you got PS+ subscription active, check store.playstation.com.
What's a Metascore™? How game prices are calculated?
What's a Metascore™?
Metascore™ is an average score for games from various reviews around web, gathered in one place on metacritic.com.
There are 3 score categories by color:
99 - green (score between 75 and 100) - very good games
74 - orange (between 50 and 74) - average games
49 - red (below 50) - low quality games
Score visible on website is an average fetched on a day when game was added to our database, so in case of game release at same day or very close, this score may change later on metacritic.com or even be unavailable.
How game prices are calculated?
We tried to assign ID from PSStore to each game, according to correnty..
Once per 24 hours, we fetch current price from store, and calculate a total in current month.
Given price is the MAXIMUM price visible in store, without any promotions/PS+ discounts.
 - stores for which we get prices and their currencies:
PLN - Poland
GBP - United Kingdom
EUR - Germany/France
USD - USA  - some games aren't available in Germany because of PEGI age rating (18+) and violence, for those we're using French store