Personally I would not use a compost tea during flower. The amounts needed would be too high. I do not like spraying lots of anything on my plants especially during flower. Notice my dosage - 15 drops, which is less than 1 ml. However, since fox farm nutrients are powerful that still has an effect.
Compost teas are more for beneficial bacteria than nutrients. Many growers assume that compost teas are a great fertilizer, but not really. They are okay at best in terms of nutrient content, it’s usually very low. In one handful of compost (or earthworm castings, vermicompost, which is ideally what you should be using) there isn’t a ton of nutrients. If you put one handful of compost on one plant, how much difference will it make? Not a huge difference, you need at least a few handfuls when top dressing. So if you put one handful in a teabag, mix that with 5 gallons of water, then water that to a few plants - how much nutrients can each plant possibly get? 1/3rd a handful of compost? It isn’t even that because only a fraction of the nutrients in that handful will be extracted into the tea.
The teas are however great for producing beneficial microbes if kept aerated.