While EB3 filing date is current and final action date is only few months behind, it could drastically change by the time you get get your PD for your EB3. So if ur employer is willing to sponsor u, tell them to start the process ASAP.
In any case, you have to be in legal status when it's time to file ur i485. If you are still in TPS status by that time, u can file i485 but if you are no longer in TPS status, either u have to find another legal status or leave US and go for consular processing as opposed to i485 process. If you remain out of status, getting GC through i485 or consular processing will be extremely difficult.