1. When your I-129 is approved, you will get an attached I-94 with
the same number as your current i-94, with an expiry date one year
later than your current expiry date.
As was indicated, you remain in valid TN status PENDING the decision
by USCIS, for upto 240 days after expiry -- as long as you stay in US.
2. To re-enter the US after your original TN expires, you would
either need to wait for approval (and then either have the approval
sent to you or ask the border officer to look up you approval in the
sytstem), the officer would then issue you a new i-94 with
(typically) one year added to your status.
OR, more simply,
make a new TN application at the border. Thi new application would
result in a new I-94 with a 12 month expiry from the date of entry.
You would then submit a request to cancel your I-129 request, to
avoid the situation where your I-129 would be rejected.
the same number as your current i-94, with an expiry date one year
later than your current expiry date.
As was indicated, you remain in valid TN status PENDING the decision
by USCIS, for upto 240 days after expiry -- as long as you stay in US.
2. To re-enter the US after your original TN expires, you would
either need to wait for approval (and then either have the approval
sent to you or ask the border officer to look up you approval in the
sytstem), the officer would then issue you a new i-94 with
(typically) one year added to your status.
OR, more simply,
make a new TN application at the border. Thi new application would
result in a new I-94 with a 12 month expiry from the date of entry.
You would then submit a request to cancel your I-129 request, to
avoid the situation where your I-129 would be rejected.