The best it means is that, when the spreadsheet was produced, the cabinet providing service to 100% of your postcode was included in the plan. The phasing no longer means anything, so it doesn't say anything whatsoever about *when*.
The BT Openreach website has a section that tells you when the exchange is expected to go live. Looking at
the "where and when" page, you can see Woking listed as Dec-11 in the "Coming soon" list.
However, that date is only when the *exchange* is planned to go live, which might happen when only the first 10 cabinets or ready. The dates for an exchange as a whole give you no information about when any one specific cabinet will be ready - which could be many months afterwards.
The best date for *your* line will come from the DSL checker. While it holds an end-of-quarter provisional date, you can only really expect that it means (to BT) "sometime in the that 3 months, or the 3 months afterwards"... even when you are only 2 weeks away, it can rollover to the next end-of-quarter.
The only time to trust the date is when it changes to a specific date (ie not end-of-quarter), which it will usually do so around 2 weeks before it is RFS.
This time last year, Brookwood was due to go live in Sept-10. The exchange eventually went live in November, and the first cabinets that I could see went live in mid-December, with the first orders going live just after Christmas. My cabinet (middle of Knaphill), instead changed dates to end-March. In mid-March, the dates changed to mid-June. A week later, it changed to the 25th March or so (a real date). I ordered that day, and it still took until June to get service...
I advise patience.