"We will be performing maintenance for patch 2.5.1 on the PTS on Tuesday at 11:00AM EDT (16:00 BST).
Maintenance for the week of July 04:
• No PC/Mac maintenance – July 04
• North American and European PC/Mac megaservers for patch maintenance – July 05, 4:00AM EDT (9:00 BST)
• ESO Store and Account System for maintenance – July 05, 10:00AM EDT (15:00 BST)
• North American and European Xbox One megaservers for patch maintenance – July 06, 6:00AM EDT (11:00 BST)
• North American and European PlayStation®4 megaservers for patch maintenance – July 06, 6:00AM EDT (11:00 BST)"
Is it rescheduled?
https://forums.elderscrollsonline.com/en/discussion/274961/pts-patch-notes-v2-5-0#Item_0