docker opendronemap/odm:gpu prints “Found GPU device: NVIDIA CUDA” in log in opensfm section, but “nvidia-smi” shows no GPU utilization during process. The time is the same to the opendronemap/odm (without GPU). Both runs in ~17 minutes.
Since you chose fast-orthophoto, the part that benefits the most from GPU acceleration (openmvs / point cloud densification) is not invoked, so runtimes will be more or less the same. It might be a bit faster on the feature extraction step since that’s accelerated too, but not enough to make a significant difference.