OPT EAD贡献个dp/timeline

号段：YSC1990164XXX
initial post-graduation OPT
2.19邮寄申请材料到USCIS
2.21显示邮件delivered
3.5收到i797 confirmation, case was received on 2/28
5.7显示case已被处理
5.10显示ead card was mailed
5.15 EAD card has arrived

整个流程基本刚好卡在90天内搞定