Answer 1

现已在延期内，且EAD卡到今年5月10日还有至少150天有效期者，可以申请额外延期7个月；除此之外的STEM学生不受任何影响，OPT有效期按EAD卡上的为准。

Comments

意思是OPT，10月10号以后到期的EAD，才可以申请额外的七个月opt？

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As noted above, after the effective date of this final
rule, certain students with 17-month STEM OPT extensions may apply for
an additional 7-month extension to effectively obtain the balance of
the new 24-month STEM OPT extension. To qualify for the 7-month
extension, such students must have at least 150 days remaining before
the end of the student's 17-month OPT period, and they must otherwise
meet all requirements of the final rule governing the 24-month STEM OPT
extension. 这里是原文，建议您最好向学校ISS Office确认。