#2 position ahead of all the companies could definitely happen before the end of the decade, maybe even sooner.

Passing Gold though will likely take a few decades. Even if Gold price didn't increase at all, that'd take over $1M Bitcoin, so we're talking probably at least 15 years. But there's a decent chance Gold increases a good amount over that time, so maybe more like 25 years.

Of course on the other hand, considering how much Gold has gone up the past year, the price of Gold could definitely head back down for a number of years, as it did most of last decade, so that it's possible if Bitcoin is like $800k, let's say, by last 2030s, it could already have passed Gold's market cap. But if Gold keeps growing even a few percent a year it'll take much longer than that.