Fabrizio Romano is reporting that Thomas Partey is currently flying to Arsenal as the Gunners aim to get his papers registered in time to meet the 11pm deadline.

Despite having months to complete a deal for Thomas Partey for his release clause of €45m, Arsenal have waited until deadline day to complete a deal for Thoms Partey for his release clause of €45m.
They have now paid the full fee to La Liga and are free to sign Thomas.
Delicious pettiness from Arsenal. Atletico refuse to negotiate, Arsenal respond by waiting until the last possible moment to activate the clause and not even telling them directly. https://t.co/Mz1cBribNJ
— Dan Critchlow (@afcDW) October 5, 2020
The player reportedly had a medical in Spain and now, according to the reliable Romano, is currently on a flight to London.
https://twitter.com/FabrizioRomano/status/1313161232401215489
No doubt an Arsenal fan will find his flight and we’ll all be able to track it likes stalkers.
As Partey has a release clause, Arsenal did not have to deal with Atletico Madrid. All they had to do was go to La Liga, plop down the cash and then they could talk to Thomas to sort out personal terms.
It also seems like the 27-year-old has agreed a four-year deal
4 year deal for Partey it seems
— Osman (@OsmanZtheGooner) October 5, 2020
He will have the second part of his medical at London Colney before signing and posing for some snaps.