I'd wait on a rate lock for at least 2 weeks. Rates should drop again. But the vibe I get from my financial advisor is that many signals point to inflation becoming a concern in Q3 and rates might begin to rise. At the moment I see sub 6% rates so that's quite good. But the rates are expected to be cut again so that might get you 5.6% versus 5.8% for example. Over 30 years that's a big savings. Heck, over 5 years that's a big savings, considering most of what you're paying the first 5 years is interest anyway. Don't get me started on amortized loans

I consider amortization the largest racket in the country. If the average family stays in their home 5 years, then they never generate equity unless real estate appreciates. Ooops, I'm getting started

Anyway, that's not something to worry much about in Franklin County. FC is the fastest growing county in the Roanoke metro and the property you buy today will be worth at least 8% more every year for at least the next 10 years, if not much, much longer.
A-1 zoning is simply a designation for land use purposes. You won't get any tax breaks for the designation. It likely would make it more difficult to get approval on the subdivision of a 1.5 acre lot, I'm sure

On the other hand, A-1 zoning blocks industrial or non-agricultural commercial uses of the real estate. Meaning, you could obviously operate a home office without permission but to hang a sign and invite clients you'd need special county approval?
If VDOT is going to be straightening out Hardy Road in front of your house I'd make damn sure you see official state surveys that document exactly how they will be affecting that property. Questions I'd have are, what is the right of way that VDOT currently owns upon your land (25', 50', more?) and what, if any, is the proposed increase of right of way? It would be easy to see how a 1.5 acre lot could quickly become a 1.25 acre lot if the right of way is increased. In the worst case, straightening out a road would imply that a 1.5 acre lot could easily be taken by imminent domain if the new road itself "needs" to head straight through your living room. I don't mean to scare you, but it's important to get these issues addressed before you make any offers. And don't take ANYONE'S word for it, no matter how nice they sound. Everything should be in writing and VDOT documentation should be signed documentation, not "proposed" or "draft" documentation.
Sean