To perform successfully, esp after promising; come through: It's a very tough assignment, but he thinks he can deliver/ He talks big, but can he deliver the goods?(1909+)
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with deliver the goods
Do what is required, come up to expectations. For example, Kate delivered the goods and got us the five votes we needed. This phrase alludes to delivering an order of groceries or other items.
[ ; second half of 1800s