I spoke to my post man this morning. They are officially on a rolling strike, which means it's not completely shut down but it is a strike. He also mentioned they are hoping its over before the weekend is out.
so you can still use regular mail it just might be slower then normal (with canada post that could be really slow ahah). However for those who want 100% promises on time delivery i suggest switching to somewhere else like fedex or not buying and selling from canada for the time being.
If i find out anything else i will update!