It's going to take you a while to move all those mats. If it were me, I'd probably sell at least 1/2 of those over the next few weeks or months. Actually, if it were me I'd sell everything unless I knew I was going to use something.

A lot of people probably have a TON of mats they saved up, and will probably want to dump them before CAT as well. They want to clear out their guild bank or alts to make room etc...

I'd sell it on Friday, Saturday, Sunday mostly, seems like the prices are higher then....

You might get lucky by not selling, and have one or two of the items go up in value, but I think most of the items will go down in value, that's why I wouldn't wait.