To that specific question, if you are on the ball you should be able to get away. One negative to a covert ops cloak is that it has a re-calibration time, which extends the time to lock a target. So if someone decloaks on grid with you, a frigate sized ship should be able to warp off before a T3C can get a lock.
That being said, and keep in mind I am bad at PVP, but back in the day (Just came off a 3 year hiatus) I liked to hunt in wormholes with a cloaky T3. Ventures were annoyingly hard to catch. Impossible if you got on grid and decloaked. So typically I would figure out a warpin, then do a short warp. I’d try to time the decloak so that the re-calibration timer was done as I landed and I could lock immediately. The hope being that they would have not done a dscan while I was in warp. It worked sometimes.
So if you are mining in LS for example, if someone enters local I would make sure to stay on dscan. Mine away from the warp in point, and things like that.