Actually the end of bull run is something we dont know, so it is depending on your intuition and perception. Also it is better to always set up your target price and do not be greedy. We have to make a brave decision to cut something as long as we have already achieve our goals and profits.
No one knows when, as there's no accurate answer for that. Bull and bear depend on the market situation and you are right instead of worrying about that better to set your target and let time to reach that and bank your profits.
it's opinion base and each time someone made a statement about bull run correction take place, you should watch the market carefully and try to earn as much as you can.
You need to control greed inside you to always have better chance of earning profits.