Hi Apoorva! This is pretty good, but there are a couple of things that I would change. Most of the corrections are about context. The more advanced in English you become, the more aware you are that certain words are only used in certain situations. It becomes easier to know when to use certain words the more you practice the language. Your paragraph is very good, and I am being very picky.
First, I rarely hear "diurnally" used in everyday life. When I looked it up, it seems to usually describe an animal's behavior pattern. For this kind of situation, we usually say, "every day" since it's kind of expected that he's checking his seeds during the day and not at night.
Second, you can say dream instead of daydreaming. Daydreaming usually happens when you're bored and to escape your boredom, you escape reality and daydream. In this context, the couple are happy and are anticipating or dreaming about their rich harvest.
Third, instead of saying "would not have arrived," a better phrase would be "would not have happened" or "would never have happened."
Lastly, I did notice that this is mostly written in the past tense, but it sometimes shifts to the present tense. In English, stories are only told in one tense. The tense choice is up to the writer, but it must be one tense or else it can confuse the reader. The exception to this is when writing dialogue.
I hope this was helpful.