my feeling is that the plan is to get out of level 4 on the 22nd, however level 3 will be the next step, we wont go from 4 to 2. Level 3 will be almost as tight as 4, no unnecessary travel, especially international. It's unlikely that sports will be played at any level. Likelihood is that we'll be in 3 for at least another 2 weeks, as that seems to be the infection period for the virus, maybe 4 weeks. We will still be working form home - those of us that have jobs and can continue to be at home working. Level 2 wont be for another 6 weeks and at that point I'd expect to only arrive when no new cases of Covid-19 have eventuated - but our borders will still be locked up tight with only those who can prove they are not infected and have come from a 'safe' place will be allowed in.
Whether this means the league can finish or not - who knows?
I think we're still looking enforced quarantine at the border even when we're at level 2 with an exception potentially of Pacific islands.