Exporting all wireframes will also generate images for any alternates you have created. The shortcuts for exporting a wireframe and project to image files are CTRL/ ⌘+ R and CTRL/ ⌘+ SHIFT+ R, respectively. Note: If you check the 'Use Transparent Background' option (in the Project > Export menu), the exported image(s) will be transparent anywhere the canvas shows through in the wireframe.
