One reason why a tomato variety is early is because its flowers set early in the season, and therefore, its tomatoes will reach maturity early too - all things being equal.
In my experience Red Alert and Glacier are among the earliest varieties to set their flowers and produce "baby toms" and I know that these will also be the first to produce fruit.
Among the cherry varieties, I would put Red Alert first, followed by Tumbling Tom, and then Garden Pearl as the order for flower set among these three varieties.
It can be frustrating waiting for flowers to set fruit, especially if they are affected by blossom drop - when a flower drops off its stem because it did not pollinate.
Keep misting with water and tapping those plants ... you'll get some results soon!