Don't bother ordering ahead.
I placed my order through the app and waited the 30 minutes it estimated before arriving. By the time I got there, the app showed my order as "Ready." It clearly wasn't. For the next 30 minutes I watched customer after customer order at the counter, receive their food, and leave while the only employee ignored me despite seeing me waiting.
When I first asked about my app order, he simply shrugged and pointed at the line. It wasn't until I walked back up 30 minutes later to ask again that he finally checked the stack of online order tickets and started making my food. It certainly appeared that my order had been marked "Ready" long before anyone had even started it.
To make matters worse, they had run out of one of the main ingredients for my sandwich. Instead of offering a comparable substitute or adjusting the price, he made a cheaper version and still charged me for the more expensive sandwich.
Ordering ahead through the app was completely pointless. It cost me extra time, I received worse service than the walk-in customers, and I didn't even get what I paid for. I also contacted Subway through their corporate website and never received a response.
I would not recommend ordering ahead from this location.