This boost is optional if building a Wonder or District: placing it on the tile without harvesting will prompt you that the feature will be removed. The type of yield is the production bonus the removed resource or feature would provide. The quantity is scaled by research progression and is modified by building production bonus multiplicatively - which is the sum of modifiers from policy cards, civilization ability (in the expansions), Dedications, and certain titles. Also since Rise and Fall, the base yield (after research scaling) is separately modified by Magnus' default title multiplicatively. If harvest results in more Production than the remaining Production required for the city's current construction item, the excess is stored and used for the next construction item.
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In Rise and Fall, the overflown Production is committed only on the turn's passing unless it is a new district placed this turn, which immediately absorbs the overflow. In Gathering Storm, the exception is removed. Up to Rise and Fall, the modifiers that apply to the quantity of the harvest follow the current construction in the city, which the player can freely swap between different items, changing the corresponding modifiers, within the same turn.
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In Gathering Storm, the modifiers are determined by the construction in progress at last turn's end. If the previous construction is completed, then no building modifiers are applied to harvest yield.