Retirement tax questions

I’m planning to file by mail (rather than e-file) and attach Form 5329 (since I didn’t get a 1099-R from Invesco, and TT Online can’t handle Form 5329 under those circumstances). Must I make the 50% tax payment at this time, or can I just submit my return with the Form 5329 and wait for their decision on the waiver request?

Thank you.