stock option margin netoff

i have this bull call spread , will i be able to hold this position till last day of expiry without requirement of additional margin

This depends on the moneyness of your Long Option position. If your Long Option is ITM, the exchange blocks physical delivery margin from expiry minus 4 days. This has been explained in detail here.

If your long option position is OTM, then there will be no margin increase.

Also, for short option position, margin requirement will increase on expiry day to 40% of the contract value or SPAN + Exposure margin, whichever is higher.