after you defuse, it shows how many seconds were left where the round timer would be. also if you want to know if you have the defuse or not, search up "eggwick spike" on youtube. hard to explain it in words but something about a white orb coming into the bomb.
idk its pretty ez to remember the timing, somehow still on d3-imm players cant understand spike timings, when they can defuse, when they should retake etc etc, its kinda surprisin