Yes it is Fabio!
FoxSportsWorld have been televising the NRL Grand Final LIVE for about 3-4 years now. Thanks to Lachlan Murdoch.
FSW is televised all over North America
and Canada, but depending where you are going in the US and the time zone you'll be in (Atlantic , Eastern, Central, Mountain or Pacific), you'll have to find out what time FSW will be televising it LIVE, as well as the exact TV channel number as this varies from state-to-state.
The best way to do this is contact FSW through the URL I provided above. As they say "check your local guides."
Or of course you can keep track of Sydney time while your in the US and switch on just prior to kick-off....as long as you know the FSW TV channel number in the locality you'll be at.
I hope this helped.