Since this is an active deal, you probably want to discuss it with your realtor.
Generally speaking, sellers are looking for buyers that they can ge comfortable will get to closing. If you had a formal loan approval from a lender, then I would offer that up to a seller as evidence of your viability as a buyer. Some sellers are taking that extra step up front to confirm that a buyer's financing is viable....something that your lender would normally do a little later in the process. You can ask your lender to give you a loan commitment and you continue your home buying process.