There is actually no better time to ensure everyone votes now because it can be done by mail.
It's not so simple. Local governments are responsible for organising electoral commissions, and many cities are now point blank refusing to do it due to the hazards involved. There are also serious questions over international observers being able to participate, and it's very clear that this wouldn't be a free or fair election if the votes are to be counted by the government rather than under the supervision of the National Electoral Commission.
From a technical point of view, as of today, there are no changes in electoral regulations. If the Sejm passes postal voting regulations on Friday, then the Senate has 30 days to consider them - which means that they can be held there until the 3rd May. They would then need to go back to the Sejm on 4th May, which even if Duda signs immediately, they'd have only 4 working days to produce and distribute ~30m votes.
More importantly, one of the coalition parties in the government has made it publicly clear now that they want a delay.
There are no conditions for holding a vote in these circumstances. If they push ahead with this, it will be a coup d'etat and Polish democracy is finished.
People like dolno will cheer though, because he picked up Stalinism with his mother's milk.