There is typically info a few different spots to verify what forms are available or not:

1.  https://myproconnect.intuit.com/releasedates follow this link, select 1120S & states, scroll down to NY and click on Form Info.  It will list the supported forms and if it is ready for efile.

2.  the Readme provided with each release also usually details what forms are available or not with each release.  Go to Help menu, Help Center, click on the plus sign next to ReadMe Information and scroll down to New York State S Corporation.  

Hope this helps.