Or HaChaim on Leviticus 2:14/אור החיים על ויקרא ב׳:י״ד

1 ואם תקריב מנחת בכורים, "And if you bring a meal-offering consisting of first-fruit, etc." The word אם here means "when," and refers to the period when the first-fruit ripens. The offering of the first-fruit is mandatory whenever it is being offered. The word תקריב means "you are to offer it, it is a duty." The conditional word ואם refers only to the timing of the offering.