I think you will have to wait a little longer before you see the plants budding, but probably not a lot longer. I grow vinifera ( riesling, sangiovese, and nebbiolo ) just across the river from you , in the Vancouver area. They need to 'set roots' before you really get any kind of growth going. As far as watering goes , since they are new plants...yes. Don't let them dry out , but definitely do not over-water either. It is almost impossible to kill a grape plant stuck in the ground. Seriously! lol . I have really well-drained soil here, and I only watered my new plants about every three day at the most, depending on the weather. They did fine. Now that they are well established ( 10 years old ) I don't water at all until the hot weather arrives in July or August. I use the 2.5 gallon bubbler emitters on a drip line....run them for a few hours when I DO water. You will know when the grapevines need water because they will not be as 'perky' as usual . They will droop ...especial the small tendril parts of the upper canopy. When you see that...it's time to irrigate a little. Remember...grapevines will 'set ' a root that goes down at least several feet , looking for water. Once they have that tap root growing well , they almost take care of themselves!
*side note* Plan on looking into spraying for powdery mildew ! This area is notorious for mildew, it DOES happen , it WILL happen , and if it does it will ruin your year's crop. Period. So, look into a spray schedule of about once every two weeks. Even your new plants before budding, because mildew will 'embed' itself in the bark,too. Nasty stuff but totally manageable with sulphur spray.
Have fun! Growing your own is a blast!