WImbledon Tickets/Que

Hi all,

Wondering if anybody on here has any recent experience of how the queuing process for ground passes works at Wimbledon. I'm primarily looking for ground passes for the outside courts during the early part of this week. 

I'd like to think the chances of outside court tickets would be do-able as I'm not particularly interested in the main courts so early was hoping if anybody could confirm from past experience on how busy the outside courts usually are early in the week. I went to the French Open last month & purchased ground passes in advance which made it a lot earlier.

Any help/thoughts would be appreciated in advance.