H1B Extension Visa Stamping in Canada(first time getting stamped in canada)

[chandu27]

I am planning to get my H1B Extension Visa Stamping in Canada. I am pretty sure visa stamping process will go smooth.

I have a question if in case for some reason (not expecting this but understanding the process) H1B extension visa stamping taking longer than expected(Administrative processing,etc.) than can I travel into US with my British passport during my H1B visa stamping process is in progress?

British citizens are allowed to travel in US for 90 days(which is not allowed for work authorization) right. So can I enter into US during the H1B extension visa administrative processing period and when the US Consulate in canada administrative processing is complete than I will go to US Consulate Canada and will hand over my passport for H1B visa stamping.

Any good info on this query will be greatly appreciated!