We can book a profit of 52% on the ZEN debit spread if we close it out today.
And that is what I suggest you do.
Here is how you close the position:
Sell to Close August 21st - $87.50 Call for $9.20
Buy to Close August 21st - $92.50 Call for $6.00
The net credit will be $3.20 per spread. The initial cost of the spread was $2.10, so the profit is $1.10 per spread.
If you traded the suggested 4 lot, your cash return is $440 or 52% for 4 days.