The Galaxy of Creatures book depicts all episodes of Star Wars Galaxy of Creatures taking place a relatively short time apart. 
Star Wars Galaxy of Creatures — "Porgs" features porgs on Batuu, a species that Star Wars: Tales from the Galaxy's Edge establishes were not present on the planet Batuu until the Resistance brought them there between the events of Star Wars: Episode VII The Force Awakens and Star Wars: Galaxy's Edge. Therefore, porgs must have been introduced to Batuu between those stories, which corresponds to 34 ABY per Star Wars: Timelines, meaning that the events of Star Wars Galaxy of Creatures take place during or after 34 ABY.
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