Upvote:4
Will the traveler currently be eligible for the Canada visitor visa
If the traveler is otherwise eligible, I don't know of any Canadian rule specifically denying eligibility in this situation.
In his Canada visa application, should he put his home country or the US as his "country of residence" (field 7)?
Home country, he's a visitor in the US.
For the "country where applying" (field 9), should he use the date he entered the US as the "from" date and the requested end date of his US visit (on US Form I-539, pending) as the "to" date?
Yes