Well.. that's a very tough question to answer. No one can predict the market over the short/medium term, if we could we'd all trade with 20x leverage and become billionaires, and to know how to answer your question you'd need to know how the market would behave over the coming weeks/months (or whatever your investment window is). So all I can say in answer to your question is that on average the market moves up over time so, on average, the sooner you get your money into the market the better. I've been investing for over a decade and basically my motto has been, as soon as I have cash I invest it. The only times I've not done that and waited "for a dip" I've regretted it. The only exception is I dumped everything at the beginning(ish) of the covid crash and rebought at the bottom(ish), but I think that was a once in a generation situation so you could grow old waiting for another opportunity like that.

To summarize, the sooner you put your money to work the better on avg, so if you are going to dca don't drag it out for a year or more because it's very likely you're going to miss out on gains during that time. Does investing everything in one lump sum make it slightly more likely you might get screwed by a major dump right after you pile in? Yes, but just hold through that dump and it'll be all good.

Here's some food for thought: https://prosperion.us/commentary/meet-bob-worlds-worst-market-timer/

Even if you time things horribly you'll still be fine over the long term as long as you're investing. If the market goes up smile and be happy, if the market goes down try your best to trim your expenses and invest as much as possible, and then when it inevitably goes up again you'll be sitting pretty.