Muscle don't lose that fast. You guys lose in size due to glycogen. That's why ppl go gym everyday to get the pumped look.
Now its the best time to count calorie and eat at maintenance plus bodyweight exercises to maintain your muscle mass.
Eat less u lose faster and there's no point to eat at surplus since you don't have proper equipments to make any gains.. only gain fat.
When Gym Opens Again?, Covid-19 MCO feels too long