I find the lack of a scale of room width (depth in the photo) makes it hard to give even a WAG. If those are 4' x 8' risers, however, then I would estimate a 32' wide stage. That makes the room width 100' +, (maybe 150') so a side fill array isn't out of the question, nor a delay speaker. The arrays look like the are tipped up, but maybe there is a balcony area at the rear of the space (to the left in the picture).
Is this a church, or a meeting room? That's a dang big Da-Lite fast-fold screen lurking on the far wall, if I have my perspective right. Mark C.