通常来说，五月底之前如果申请费的支票没有对兑现，基本上就是没有抽中了。因此您的情况申请OPT Extension是来得及的。只要递交了OPT 延期的申请，可以凭I-765的收据自动延长OPT 180天，这个期间不会有一个文件或卡片给您，说明您的OPT被延长了180天。
可以参考移民局官网的说明。
https://www.uscis.gov/i-9-central/complete-correct-form-i-9/complete-section-1-employee-information-and-verification/foreign-students
F-1 OPT STEM Extension
A foreign student who received a bachelor’s, master’s, or doctoral degree in science, technology, engineering or mathematics (STEM) may apply for a one-time, 17-month extension of his or her OPT while in a period of post-completion OPT.STEM students must work for an employer enrolled in E-Verify in good standing. A STEM student may change employers, but the new employer must be enrolled in E-Verify before the student begins work for pay. The following documents establish the student’s identity and employment authorization and should be recorded under List A in Section 2 of Form I-9:
- EAD or
- Expired EAD which is considered unexpired because the STEM extension application is still pending. This EAD:
- Must be presented with Form I-20 endorsed by the Designated School Official recommending the STEM extension
- Acceptable for 180 days from the expiration date on the card
- Must be reverified after 180 days
If the student presents an expired EAD, described above, the employer should:
- Record the document title
- Record the document number
- Record the date the EAD expired in the expiration date space
- Write “180-day Ext.” in the margin of Section 2
When the 180-day extension expires, the employer should reverify the employment authorization.
