Hello friend @robotics101, no doubt the mature compost will be useful for your garden, when we make a compost there occurs a process of mineralization of organic matter, ie begin to synthesize inorganic nutritional elements that can be used easily by plants, likewise the compost can improve certain soil characteristics such as structure. I recommend you to mix the compost with the soil of your garden in a proportion of 70 % soil, 30 % compost, so you can use it massively in your garden and you will have good results.
See you later, thank you for your valuable comment, have a great weekend.
RE: Processes that occur in a compost (organic fertilizer).