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[ACT 2 SPOILERS] Completely avoided a boss fight
(aussie.zone)
Baldur’s Gate 3 is a story-rich, party-based RPG set in the universe of Dungeons & Dragons, where your choices shape a tale of fellowship and betrayal, survival and sacrifice, and the lure of absolute power. (Website)
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Not quite, for each action you do while in greater invisibility you need to succeed on an increasingly harder stealth check or be revealed, its not reliable like in DnD 5e.
While true, if you're just looking to steal something once you probably have to roll a 1 to become revealed.
If you want to get deep into the shenanigans, have someone cast Pass Without A Trace on your character before you apply Greater Invis (with someone else, since both are Concentration) and make sure your sneak thief has advantage on Stealth checks from somewhere (there is a Leather Armor that grants this for example).
You can probably kill off a couple of enemies in a group before breaking Invis (and thus never entering combat) with that setup, especially if you also have Expertise.