Since they both expired worthless the stock had to close above 95 and you realize the max gain . I would think the margin would have been returned to you by now. Call your broker and ask.
When I do credit spreads , I always close the short side prior to expiration, even if they are worthless. That way if news comes out AH and the stock reverses on me, the trade could go from max gain to max loss and when the option closes on Saturday you lose. TOS allows you to buy back any short option that is .05 or less for no commission, to entice people to remove the risk on any spread or naked position that is worthless. It's a small price to pay to CYA-lol. If you do cover those short positions, you can let the long 90p expire worthless. That way if the stock tanks after hours, your 90p could go itm and you would then be short shares, which you may be able to exercise and cover for a profit.
Options!!!!!!!!!!!!!!