Is there a way to mark annotated images within a task?

[YusukeSuzuki]

I am new to using CVAT and am working on object detection annotations with a dataset of tens of thousands of images. I created a task and began annotating, but I wanted to try training the model midway through the process. However, the output includes images that are not yet annotated. If I omit images without bounding boxes, I unintentionally omit images that do not contain the target object. Is there a feature in CVAT to mark an image as "annotation completed"? Am I unable to test my training until the entire task is completed? Additionally, is there a way to export only the images that have been marked as completed from the task?