FWIW, even during the 1987 peak the monthly MACD was making new momentum highs and still the market crashed. Nobody can rule out crashes based on any premise, ever. That's why they are called crashes. But i give that only a 10% chance.
Having said that, worrying about crashes has not made anybody a penny. Before a big correction, many things need to happen. Hourly turns down, daily turns down, 3 week lows gets taken out, Monthly 5 ATR gets taken out. It's only after that a real worry of big correction should kick until.
"It's not the knowing that is difficult, but the doing"
"No warning can save people determined to grow suddenly rich" - Lord Overstone (The great crypto mania of 2017)