If I were to pursue refinance now, will the fact that these projects are unfinished impact my appraisal? Positively or negatively?
Based on the rather significant scope of your projects, it's likely there will be an impact. "Positive or negative" can't really be answered without a frame of reference and - of course - knowing the details of the work and what remains. Certainly, your home will appraise lower than what it would after the work was finished. But I think your real question is, will it appraise higher than it would have before you started the work?
That's a harder question to answer, and while we cannot predict the outcome of your appraisal, we can explain the process.
Appraisals are largely based on comparisons to similar homes in your area. But, of course, homes that are the same "by the numbers" may be worth different amounts, so there are subjective factors in the appraisal process that account for that. Condition is a major factor which typically comes into play when a home has unfinished work.
Typically, once you begin work on adding or finishing additional space, your home would be described as including those additional spaces, but with value taken off to reflect "condition" of the spaces because of the unfinished work. (Some appraisers take this to an extreme - if you've got an unfinished attic space, it counts as unfinished space. But hang a sheet of drywall on the studs, and suddenly it's a normal old finished room, with a huge hit because of it's "condition.") A partially finished remodel is essentially treated the same as if that new room was 20 years old and starting to fall apart. In both cases, the appraiser would include the bathroom or garage, but deduct value based on an estimate to complete the work.
So, if the work is going to add $50k in value, and it will cost $20k to complete, you can assume a $30k increase in your home's value compared to what it would have appraised at before the work began. But - anecdotally, in my experience, the standards used by appraisers to estimate work is probably going to come up with a higher number than most homeowners DIY'ing a project will estimate to complete the work. So if it's going to add $50k in value, and you think it needs $20k to complete, the appraiser may think it needs $50k to complete, and you end up flat.
Ultimately, the only way to find out what an appraisal will come in at is to get one done. But if you're working with a contractor family member who knows your area well, they may be able to give you rough estimates on both the increase in value and the cost to complete the work, and you can use those numbers as a rough guide.