hi , yeah your plants look healthy to me , but impossible to guess what you are going to yield without more info , such as , lights your using , enviroment they are in and strain is also important , i have noticed however that your plants are mainly developing buds on the main stem only , this could help you narrow it down with some research , hope that helps , normally if you have sufficent light , good growing medium , some knowledge and tlc, your plants will be fine , they are weeds afterall =)