Achieve has just posted on their website, NGSS Alignment Claims: What Publishers are Saying, which will help you sort through and be aware of the many claims currently being made by publishers regarding their instructional materials alignment to NGSS.
Keep in mind that K-8 instructional materials adoption by the California Department of Education (CDE) will not happen until November 2018, after which districts will assemble their teams to review materials and make their adoption recommendations to their local Boards.
So, realistically, NGSS-aligned and state board approved materials will not be available in classrooms until after January 2019.
For your reference, here is the CDE adoption process schedule:
|Instructional Materials Samples Due||May 4, 2018|
|Independent Review||May-July 2018|
|Reviewer Deliberations||July 16-20, 2018|
|IQC holds public meeting to receive comment||August 13, 2018|
|IQC makes recommendation||September 20-21, 2018|
|SBE holds public hearing to receive comment||November 8-9, 2018|
|SBE takes action on recommendation||November 8-9, 2018|