Juli Clover, MacRumors:

There are two separate widget options. The first allows users to check traffic conditions, store opening times, restaurant reviews, and more for a given location, while the second is designed to let users find places that are nearby like restaurants, gas stations, and grocery stores.

And:

The Google Maps widget can be accessed using the “+” button either in the Today View or on the ‌Home Screen‌ after downloading the latest version of the app.

If you are not finding the Google Maps Widget, make sure you have the latest version of Google Maps (follow this link, tap Update), then, in the Home Screen, long press to enter wiggle mode, then tap the “+” in the upper left corner. The Google Maps widget should show up there.