I think the answer to your question depends on the objectives you have. If selling the bitcoins will give you the profit you need for accomplishing your objectives, it is the right time to do it. If not, I think you should wait more and don't panic about selling recklessly and missing opportunities for more profit. However, stay paying attention to the market and beware of not being taken by surprise by a sudden devaluation of bitcoin.
Agree, I would say there is no an exact time to sell bitcoin, but there is a safe time to sell Bitcoin. And in my opinion, the safe time is now because the increase is incredibly high. If you are still not sure and want to hold for a longer time setting a stop-loss order is the best solution in case the correction/pullback happen.