I'm very bad at calling "tops" & "bottom". If the market taught me anything over the past 25 years, is to NEVER jump in front of a moving train ;-)
Looking at the Top40 technically, it does seem like we're in "overbought" territory according to its RSI.
The trend is however very strong (moving averages are also starting to "smile"), we saw a "Golden Cross" on 26 March (very positive) and we could possibly go and test that resistance at 51,850 (if you're short - this could possibly be your stop-loss). Be VERY careful calling a top!!