Plan on waiting in line. The new phones came out last week and every night there has been a big line. Getting shorter but I'd guess 8PM might be a little late as the last few days the line has still been more than an hour. You can make an appointment online or on the phone and you will be in a shorter line but still a line. You might try contacting your provider first.
Just call the store if they have in stock. Also check the timing of the store if it's open at that time. Just checked it's open till 9pm.
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