From what I know, if you didn’t claim the “valid job offer” points, you likely won’t need to submit a written job offer later in the process unless they ask for it specifically. It sounds like you’re on the right track with your PGWP and experience. I’ve been looking into some online programs lately. I was thinking about changing careers, and I found this one that might be helpful for anyone interested in healthcare: 9 Best Online Sterile Processing Technician Programs. If you’re curious, here's the link:
https://www.steriletechprograms.com/online-programs/. I’ve heard good things about these programs being flexible for people with busy schedules.