Yes but not always the results you want. In the good old days we have had 'next day' successes from a new Campaign for a new client. Today's Google Ads is all about machine learning and combinations and this can take 5 days or so to be optimised. And results are not just about lead conversion. Some ads are there specifically for brand awareness and we broadcast your products and services to as many of the right people as possible. This does happen instantly.
Also don't forget that even poor performing ads tell their own story. That's why it is imperative to keep on top of any Campaign so we are constantly tweaking and perfecting.