Tell us about the final interview experience cause of those that are yet to go for their interview

i went to canada four days after i landed in maryland usa at the port of entry in newyork they collected the envelope given to my husband and i at the embassy with the visa and stamped it then the man said we can stay and travel whenever we desire before our green card is ready and will be sent to our address when we got to the Canandian border they checked my visa in thier system and found that i was a legal immigrant so they allowed me and yesterday i got a letter from the states immigration welcomimg me to us and stating that i will get my green card latest 30 days from the date on the the letter. so is possible you travel any where i also plan to travel to london soon.