I think this can be useful up to a certain degree. You can check from time to time. Especially when it comes to meme stocks and hype stocks, if you are in for the uptrend and looking for a signal as to when to sell, this can work in your favor. When you see the Google trends indicator reaching extreme levels, it would not be illogical to thinking about getting out.
But idk whether or not it can be used in a reliable way for buying or loading up on calls. Because once you hear about a stock or a ticker on a forum, discussion boards, social media or mainstream television, the stock will have already gone up a few X'es. Even if you are in way early, it would not be visible enough on Google trends to give you a solid conviction.
So, not a 100% useful, but it's definitely worth checking out from time to time.