So if you submitted an application now, there's a very strong possibility you'll receive the passport with the visa before the expiration of your current TRV (that is if you're not called for an interview). If you get called for an interview, you'd need to apply for a US B1/B2 visa and there's a possibility of not being given one. Or as you have indicated, you can go back to the Philippines and then come back to start your LCP employment. You'd have to communicate with your prospective employer about your plan of leaving Canada before starting your employment with them. There's also a chance the officer at the POE will get in touch with your employer upon your return to verify if they're expecting a foreign worker to work for them.
i hope that there will be no interview..just what had happen when i got my visa in taiwan..thank you very much...actually were 2 workers approved for this LMO coz the employer need 2 for his disability case.will pass the application by thursday..thank you very much..hope to hear again from you if i got more questions..God Bless