Graphics on SSD1306 and Pico - Tutorial

SSD1306 With Raspberry Pi Pico : 6 Steps - Instructables
Hope this helps if you are just getting started with these boards

It wasn’t the main purpose but the code in Instructables: Soil Moisture Sensing With the Maker Pi Pico shows how to do simple graphics on the SSD1306 from a Pi Pico in the parallel universe of CircuitPython.