As the UK resignation date approaches I would suggest a blanket statement applies to whatever country you are hoping to go to. DO NOT resign. No one has a crystal ball. A country that is relatively OK now could be a disaster zone then. International travel will be challenging with those who already have residence being the first allowed in. Any school making promises of honoring contracts (when you haven’t even started working for them) etc is flying a bright red flag just to hedge their own bets. No school knows and the only honest answer from admin is “we are hoping/intending/planning...” I expect schools in a lot of places will reopen (with restrictions) in September. If you have already resigned or you are not in the country of your school. Start making plan B and C. I realise it’s hard to accept a dream opportunity is likely to pass you by and it will be even more galling if you find out then that you could have gone...but it’s a gamble only a few can afford to take. And there will be other opportunities.