Hi Coffey5030.
At this point I wouldn't worry about the time it takes to cycle. You have fish in it, so the 50%water change (that's around 27 gal of water, changed daily) will keep your fish alive. The good thing about Prime (read it here recently, never used it) is that it removes
chlorine/
chloramine -which you don't need- but also prevents your tank from toxic spykes -which you do need.
In a fishless cycle, you want those spikes to happen, then to fade out. Not this case. You will need the two types of beneficial bacteria to grow in your 55gal tank. Your cycle probably needs to last longer, since you can't afford to have a sustained ammonia, and then
nitrite, spikes (lethal to fish), so aim at keeping ammonia and nitrites at least at tolerable levels (the only safe level for ammonia and nitrites is zero). Log the info of all parameters, using liquid reagent test kit (don't trust strip tests). Good thing you have plants. A "silent" cycle is possible to achieve. At this point you would do better underfeeding than overfeeding your fish. Do careful substrate vacuum -focusing of solid waste only. The microscopic fellows you need grow in the substrate too. And of course leave the filter media untouched.
Another option you have, is to spend some money in Bio-Spira. I have no personal experience with it, but have read interesting stories around here. If you go with Bio-Spira, you don't need to log water parameters for the first week after adding it.
We are here for you. You can pull this off. I'm going through a mini-cycle myself, with fishlore help, I'm keeping things in order.
Good luck, wellcome to fishlore
Pepe
Santo Domingo