[2020] I see a lot of confusion about whether the defuser's "got it". There is a visual cue on the bomb for if you have enough time left to defuse: The large circle that appears and then shrinks. It starts its animation at exactly 7.5s left on the timer, which is how long it takes to defuse.

https://imgur.com/a/EKYgBZR

I used a stopwatch to be sure. It takes 7.5s to defuse, and this circle starts its animation with exactly that much time left on the bomb. If you start your defusal and see this circle right after you start it, you've got it. If you start defusing as it's shrinking, you missed it--the cutoff is right when the circle first appears.

This clip made me make this post. Apologies if you guys feel like everyone knows this but I haven't seen a post here about this exact thing and I still see a lot of confusion over whether someone has it. The team in that clip aren't sure if he has it, but if you know this cue you know he has it because you see the circle shrinking right after he starts defusing.

(Don't mind the 3 tripwires. Had cheats on and was passing the time waiting for the animation to show.)