The regulations enacted by the USCIS on 17 January 2017 have created a new class of employment authorization - "Compelling Circumstances EAD." This is available to those people whose I-140 is approved and priority dates are not yet current.
Green Card
Nonimmigrant Visas
Green Card
Health Grounds
This is a compelling circumstances EAD approved in appx. 100 days in July 2017 based upon health grounds.See: http://www.immigration.com/sample-cases/%5Bcompelling-circumstances-ead…