Technically, you need to wait the 28 days to achieve the full value of the expansion bolt or sleeve anchor, but at 7 days the concrete should be a 1/4 of it's compressive strength, 14 days 1/2 and so on. If you crank down on these, concrete will spall and you will have zero value on that fastener. I have done the testing on these many times, let that concrete achieve some strength first, just enough to avoid spalling. Given it's a sill plate, would seem you'll have a lot of pull out forces, but would be nice to know you have the fastener value needed for the load, given it is what holds the framing to the foundation.
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