Poolish Ripeness

 I've been attempting to perform a Whole Wheat Poolish involving:

250g King Arthur Whole Wheat Flour

325g 2% fat milk

15g Honey for the yeast activation

60g Water.

A pinch of yeast????

I couldn't determine the mass of yeast since my scale wasn't sensitive enough below 2 grams. I let it sit in a 42 Fahrenheit fridge overnight for 8 hours and then relied on one hour intervals between 75 degrees Fahrenheit in the kitchen counter and refrigeration. This is so far how the poolish looks like.

I tried giving it a very small taste and smell. I notice a somewhat sweet smell and an extremely light tang. Is it ready for use?