Non-standard RRV processing times have increased very significantly in the past 18 months. In late 2016, a couple of days was reasonable, now 4-6 weeks seems to be the norm. The Department's website suggests that 90% of RRVs are processed within 47 days - it would be reasonable to follow up at that point.
As you have been in Australia as a permanent resident within the last five years, but not for two years in the previous five, what you need to have demonstrated in your application is that you have "substantial business, cultural, employment or personal ties with Australia which are of benefit to Australia". The reason for your absence is not relevant unless you have been away for more than 5 years.
In terms of travel to Australia, because you are offshore and the travel part of your visa has expired, your PR visa is now no longer in effect and therefore there is nothing 'to cancel' if you get a temporary visa in the meantime. RRVs are available to former permanent residents who may have travelled to Australia on ETAs or temporary visas since last holding a permanent visa.
However, as you have already applied for the RRV, it is probably better to wait it out offshore. You will obviously be in a much better position to look for a job in Aus if you already hold the permanent visa rather than having just applied for one. As you are aware, if granted, you will get a visa with a one year travel facility from the date of grant.
Hope this helps.
Paul Hand
MARN 1801974