The product certificates, or CPSIA certificates for both the Samus and Metroid amiibo for Metroid: Samus Returns have been released. They show that production of the Samus and Metroid figures took place this past June and July. Hopefully, Nintendo will have learned from past mistakes and the two month production cycle means that there will be plenty of the Samus and Metroid amiibo for us to play with come September 15th.
Source: NinMobileNews, Nintendo Support