PP+ Upgrade to Polaris with Miles

My first time using miles on United to try and snag an upgrade from PP+ to Polaris. Flight is in 19 days, and wondering how often these clear?

ORD to MUC direct ... not seeing any PZ, PN or RN available in expert mode, but I'm a newbie at upgrades, so completely clueless. Any way to checked where I'm at on list?