We know that the entire Phillies front office is flying to Vegas to meet with Harper on Saturday. The flight from Philly to Vegas is something like 6 hours nonstop, so it's certainly possible they are flying out Friday and not returning until Sunday. Knowing that a Machado decision is coming very soon (within a week per reports), this really doesn't seem like something a front office would do if they were in the middle of finalizing a contract, making arrangements for a physical to be done, and holding a big press conference.
Also, fwiw, Jim Salisbury edited his NBC article to remove the statement that the Phillies were preparing to make another offer to Machado to just say that the Phillies were "in negotiations" with Machado, or something like that. Seems like a noteworthy edit.