Okay I see this is first year micro which I haven't done in a long while but:
1. Yes, because when the Covid crisis is over, demand will have increased and so the pressure on employees will have increased, which could result in labour unions protesting, so it would be smart to raise the prices before any controversy ruins reputation and the firm;'s profit margins.
2. However, considering demand will naturally rise, this will lead to an incentive of derived demand for the firms to employ more people in order to meet the new supply demanded (diagram would be increase in D and S). By raising wages, firms will have to incur increasingly higher costs, which could possibly damage firms more as they may be paying out a larger percentage of profit than beforehand.
3. In addition, another reason against raising wages would be that key workers typically aren't incentivised to be more efficient by being paid more- a nurse will not be more inclined to treat a patient better due to a higher pay, it is simply the nature of their job, and so it makes no sense for firms to hand this money out, and would be put to better use through investment. If there was a moral inclination to show key workers appreciation, it would make more sense for a one-time bonus, as It will not affect the firm's long- term profit margins.
4. More convincingly, considering the shortage of doctors and nurses the UK is suffering from, a rise in wages may increase the demand to work in that field, therefore correcting the shortage and possibly allowing the healthcare service to be more efficient. Providing this wage increase is funded by the government, the concern of profit margins being reduced is taken away.
5. Lastly, if firms were to fund these wage raises, they may have to recuperate their losses through increasing their prices. This may affect businesses negatively if the demand for their good is elastic, which would mean a loss in profits proportionally larger than the rise in prices. overall, this could negatively affect the businesses in the long term.
6. Contrastingly, as the workers in question are essential, it also implies the goods and/or services being provided are essential, and therefore the demand would be more inelastic. This means that an overall rise in wages would not have an effect on the number of goods sold, even if the prices were raised, because the demand remains the same regardless of price, so firms can continue at their profit margins.
Hope this helps- I am rusty on year 1 micro