I wouldn't add bat guano to tomatoes... unless you want big vines, small fruit. Unless you make tea with it, I wouldn't add guano unless I haven't planted yet.
Bat guano is rather expensive for gardening.... you are determined!

Takes 4 months? I doubt that. Even so- that would mean that it releases nutrient for 4 months- not that you put it down and it acts like a jack in the box full of nutrient 4 months later.

The guano I am using is high Pho., I just want to make sure that the guano is releasing the nutrient to the plant once I apply, not wait after 4 months....

Big vines, small fruit? is that mean not good? i thought guano suppose to give more fruit, healthy vine & root?

Ops, btw US$1.90 for 1000gram/ 1 Kg Bat Guano, that is cheap! Cheapest then Chicken Manure! How could it be expensive?

I think it goes to work right away. It might take 4 months for the distinctive "aroma" to go away, but it is working the whole time.