That’s almost always where the program snags. Renovation money isn’t released at possession: it waits until the work is done and verified. In practice, you have to be able to pay the contractor up front, or have a contractor willing to wait.
Many buyers take possession, then pay for renovations on a line of credit or a card, at a notably higher rate. Purchase plus improvements isn’t offered by every lender and the rules vary: eligible amounts, types of work, deadlines. I go to the ones who offer it and confirm the eligible work list before you commit to any contractor.