DST patch for XP service pack 2

I have a general question. I followed the recommended instructions of
installing the dst update to the servers first (minus the exchanger server)
and then reseased the patch to all of my workstations. We dont plan to
install the dst patch or run the exchange update tool until sometime tommorow
when we have verified that WSUS has deployed the patch to all workstations.
Today I noticed that on a workstation that has the patch installed it shows
dates in the calendar that is between March 11th and April 1st as being off
by one hour. Is this normal at this stage? When we run the Time Zone update
tool against the exchange server tommorow will these dates be adjusted to the
correct time with the update tool?

Thanks in advance

Steve