J1 waiver question, please help

我朋友的J1 waier现在在USCIS pending

请问如果他离开美国,以O1签证入境,那他还需要重新办理J1 waiver吗?
还是等现在pending在USCIS的J1 waiver case批准后就可以交485了?

thank you very much...

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