What, in your opinion, will he be kicking? Is that a. none of the above, b. yo mama, c. the can or d. the bucket? You have 7243981 aeons to answer the question and not a single aeon more. We need to draw the line somewhere after all.
As an ex-boxing Journalist I can tell you that there is only one outcome to this fight. Mayweather wins easily. Mayweather is the best defensive boxer in the last 40 years. McGregor won't be able to hit him. Mayweather schooled so many great fighters and McGregor only has a bit of amateur experience. It will be a completely one-sided fight.
The only question is how many rounds McGregor lasts. I expect he'll only last 6 or 7 rounds. I expect he will be gassed after 3 rounds. And then due to tiredness his hands will drop and Mayweather will hit him with that fast straight right at will. Maybe the ref will stop it, maybe the corner, maybe McGregor will die on his sword, but McGregor is almost certainly going to get stopped.