Confused

For NCLEX purposes as long as you fulfil the requirements of the BON and given the clearance by CGFNS and your CES report is accepted by BON then you might be able to get away with out doing the IELTs

Next step is Employment then migration.

this is not a requirement for Green card/Visa by USCIS the US migration authority. It is a requirement by the official credential evaluator (CGFNS) used by the USCIS. You will need a Visa Screen certificate.

and the Exemption for IELTs from CGFNS website are below.

EXEMPTION DUE TO ENGLISH-BASED PROFESSIONAL EDUCATION

In some circumstances, a VisaScreen® applicant may be exempt from taking an English language proficiency examination. To be exempt from having to take an English language proficiency examination based on the completion of an English-based professional education, an applicant must meet the following two criteria:

Entry-level professional education must have occurred in the United Kingdom, Australia, Canada (except Quebec), New Zealand, Ireland or the United States; AND

English must have been the language of instruction, including the language of the textbooks.

EXEMPTION DUE TO US EMPLOYMENT - VISASCREEN RENEWAL ONLY

To be exempt from having to take an English language proficiency examination based on having worked in the United States, an applicant must meet the following three criteria:

Demonstrate employment in the United States for at least 27 months, including 9 months employment prior to the date of the renewal order.

The applicant must be employed in the profession for which he or she is seeking the VisaScreen® service.

The US employer must sign and submit an employment summary on corporate letterhead.

So if you are from the Philippines in some cases you will need the IELTs sooner if not for migration you will definitely need it for the Visa c