Seed potato help please

Those chits will be weak and white, so knock them off, get the spuds in a cool light place and let them start again to form decent ones

Unless you plan on waiting a while you probably will not have a lot of time to get decent chits before you are due to plant. I am going to get mine in this weekend, some have done so already others seem to be waiting a bit longer, mainly I think because that is when they have time off to do the planting. I would just get them in at this stage, if your chits are long and weak you will probably knock them off as you plant anyway. What you would gain by chitting you would probably lose in having to delay planting at this stage.