1078x612 pixels or Proportional variant, i.e. 1500x852 pixels or any proportion increased thereof.
Clicking on an image in Parler will give the full image, but for purposes of feeds and to keep important data visible in feed, use within the 1078x612 guideline proportion for key info, otherwise it is cut off. So, for Photoshop/Illustrator, etc. creators that means use that proportion as the bleed line for important text etc.
So width 1078 and height 612
Speaking of which, wheres Bagster?
Need my bags fix!