If they are still just dormant (and likely are), how long they take to wake up has many factors, most important would be sufficient moisture to the roots, water temp, and air temp. I cant tell those from the picture, also it looks like a NFT design but could easily be a flood and drain setup also. If it is a NFT system, it's likely the roots are not getting enough moisture. In a NFT setup just the ends of the roots would be getting any moisture, instead of the whole root-ball. I simply can't tell much from the one picture. Also how old are the plugs? Were they stored properly before planting?
P.S. I have some pdf. files that I can post about growing strawberry's if would like me to.
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