There is a Priority check-in but it's for all Rubys, Business and above, there's no longer an Emerald/FC segregation. You cannot use Flagship Check-In. If you're arriving by car/taxi/Uber try to be dropped off by the first door on the right side.
There is a Priority security line, easily seen as you walk down the line of desks towards security.
There is a Flagship Lounge you can use, you'll be directed to it when you check in at the lounge entrance. You cannot use Flagship Dining which is located within the lounge.