For most blends of fertilizer you can get slow release and quick release, though many of the slow release ones are only available to the horticultural trade, where plants are kept in pots for a whole selling season. The difference is that fast release fertilizers are readily soluble, which is good if you want a quick fix that you will repeat every few weeks, but easily leached away into the sub-soil after rain. Slow release fertilizers are usually produced inside bead-like capsules which dissolve slowly depending on temperature. There will often be a mix of different capsule coatings in one pack of fertilizer, so some will dissolve within a few weeks, and others will take a few months. I have used a tree and shrub fertilizer that released its goodies over a full year, ideal for a nursery selling trees in pots.
Blood Fish and Bone is less expensive balanced fertilizer that is slow release without needing to be encapsulated because it's constituents only dissolve slowly.
As others have said, Tomato feed does not need to be applied until the first flowers have set.