I wonder if planting Saint Augustine grass squares in February is okay.

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The contractor placed about 15 squares of yellow looking, apparently dead or dormant St. Augustine grass on the lawn where new top soil was placed to cover up a trench created by having a wrecked pick up truck pulled from the front lawn in Late January or early February. I have watered the grass at least once every 2 weeks and we had a good rain last week. Today as I watered the lawn, especially the St. Augustine, I noticed very little green within it. Is this going to come alive or will I end up having to replace all of these squares of yellow grass next month?