"Will" vs "would" in reported speech

Suppose today is 30th November. Today my friend (John) says to me on phone “I will definitely go to the market tomorrow”.

Now if I want to report his speech just after a few hours on 30th November, “will” or “would”, which one should I use? 

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• Hey mom, tomorrow I will be very busy. I will have to have got ready by 10:30 tomorrow. John told me that he would/will definitely go to the market tomorrow. I can’t miss the chance going there with him.