Even if they are not accurate you will still be able to see if you are progressing up or down. The one thing I would not use at all though it the measurement of body fat on a smart scale. Very inaccurate.
I’ve done a couple of cycles and I’ve spotted some scales that sync up to your phone and can measure everything, such as weight, bmi, BF, water weight, muscle mass etc… just wondering how good or bad these things are.