On the dashboard, there is a fretboard element that shows you information about your expected yield in the upcoming month. Each of your crop varieties are represented by a row in the fretboard and there will be a green square for each day of the next month where you are scheduled to do a harvest of that variety. By default, it will show the expected yield by weight for your harvests that are scheduled for that day. The expected yield is calculated by averaging the yield weight of previous harvests of the same crop variety. A checkmark instead of an estimated weight represents a crop variety that you have never harvested before, which therefore has no historical data to base an estimate on.
If you have prices set for any of your harvest units, you will also be able to change the mode of the fretboard to display your estimated revenue by clicking the "Revenue" button in the upper right corner of the fretboard. The estimated revenue is calculated by taking the average price per weight of whichever harvest units you have historically used to harvest that particular crop variety. A question mark instead of an estimated revenue represents a crop variety which has only been harvested using harvest units that have no price set, so a price cannot be calculated. Please keep in mind that the estimated revenues for both weight and yield are estimates and are only as accurate as the average historical data for your crop variety.