From Longman Dictionary of Contemporary Englishthat’s goodthat’s goodused to say that you approve of something ‘I’ve booked a table.’ ‘Oh, that’s good.’ → good
Examples from the Corpus
that’s good• "We're going to buy a house." "Oh, that's good!"• The stove's brand new? That's good.• If it helps, then that's good.• She had half drained her mug when she said, ` Ah, that's better!• But that's good because it keeps us out of trouble.• That's good because the letter could contain blackmail, be a love letter or anything.• That's good, but I want more.• That's good for them, because they stand to make a commission of hundreds of pounds.• The thing that's good is we've had seven takeaways already. 