Erdogan could still ratify Finland just to stir the pot, there is nothing Finland can do about it. Both Sweden and Finland have already applied and it is down to members to ratify.

Then it comes down to should Finland itself accept and sign the NATO documents ascending it to NATO. Considering our geographical location i don't see the benefit of waiting as Finland being in NATO would benefit both Finland and Sweden as Sweden would be surrounded by NATO countries.

If the roles were reversed things would be much more hairy.