Product groups are eligible for the bid simulator:

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Q - Product groups are eligible for the bid simulator:

Once a Budget cap has been reached for a product group
Once the average cost-per-click(avg.CPC) is close to the maximum cost-per-click(max.CPC)
Anytime after a product group is created in a shopping campaign
When product listing ads have been included in enough auctions or accrued enough impressions

Answer is - When product listing ads have been included in enough auctions or accrued enough impressions
GA
Gaurav Arora, Digital Media Lead. 10+ years running paid media and tracking for brands in the USA, UK and Canada.