We were just there in mid-April and we did food from Geyser Point twice. The first time was just wanting some alcoholic drinks and fries while at the pool. There was a CM/server who was coming and going at the pool area taking orders and bringing them back to where people were sitting at the pool. In order to pay with magic band, I had to give mine to her to take with her (she had several in her apron pocket when we ordered from her). Fries as a stand-alone were not on the menu, but she didn't bat an eye when we asked if it was possible to get two orders of just fries. It took about 20 minutes for her to come back with our drinks and the fries, but the pool and restaurant were both very busy at the time.
The second time, my husband and I went down to order food at the window to take back up to eat in our room. The menu was posted right next to the to-go window and it seemed to be the same as the one we looked at in the room for the actual sit-down area of GP. We ordered two crispy chicken sandwiches (we thought they were good). My husband ordered a margarita from the bar inside GP proper as the to-go window doesn't serve any alcoholic drinks, but he just did that while we were waiting for our food. There was no one else waiting at the to-go window but the restaurant area seemed to be about 2/3 full. It took about 15 minutes for our sandwiches, but they gave us a buzzer so we just sat down near the geyser while we waited.
If your plan is to eat while you are at the pool, I would recommend just ordering from the roaming server there so that you can still be enjoying the pool while you wait vs just standing around by the to-go window.