They are allowed. All depends on pilot numbers. Only in summer. Some people have applied, and got it, some people refused.
Bottom line, much easier to get than other airlines, but not guaranteed.
So as ant alludes to. The answer to your question is, no, the ground schools have not been delayed
First ground school is May 6 for five initially. Offers are out
Everyone I know who has been hired has come from an internal referral. If you know someone working there, push for that recommend.