Thank you, this is comforting to hear.Don't worry, you could get AOR before 31 March.
If you don't get AOR by 25 March, submit your BOWP application as long as you do not have any restrictions on employment in your nomination certificate. Add explanation letter that you applied for PR and you are yet to receive AOR but you are already working so you want to maintain status and you will submit AOR as soon as it is received. Add your nomination certificate and the letter, add your employment letter and pay stubs. You will be denied as soon as you fail to add your proof of nomination so don't forget to submit it.
When filling the application make sure to select open work permit. Do not fill where it asks for employer and LMIA details, make it not applicable just like you did for pgwp. In the address or location, just write the town your are working and your province (Ontario) in the address portion.
Remember to answer yes to the question about nomination certificate.
You will be fine. I applied BOWP without AOR and later added my AOR later, and I have even working since. I got my PAL yesterday.
One quick question - since we are selecting open work permit and not providing employer details, doesn't it contradict if I mention otherwise in the letter of explanation? I understand the procedural part, but just want to make sure that's the right way.