The best size for a Google My Business Cover photo (Main photo) is a rectangle of ratio 4:3, I recommend 1080px by 810px (Width x Height), but you can calculate different sizes using this ratio calculator.
You should make sure the main elements of the cover should be in the middle of the photo, you can use a square as a guide with a size 85% of the height, for example: using a photo with 810px in height, the square should be 690 x 690 px. It will help in the mobile searches as thumbnails of cover photos are square in search results on a mobile.
You may have to crop your cover to fit well.
Google My Business Cover Photo Template (click on it for the real template size):
I have a Google My Business Cover Photo Size Template for Google Drawing in my Google My Business Training.
Google My Business Cover Photo Tutorial Sections
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