The nine justices of the U.S. Supreme Court are scheduled to meet behind closed doors Friday to decide if they will consider the constitutionality of same-sex marriage, but local resident may not learn their decision until Monday.

In one scenario, the justices could allow the decision by the Nine Circuit Court of Appeals to stand.

That ruling said Proposition 8 -- the voter-approved ban on same-sex marriage -- is unconstitutional.

San Francisco officials are hoping they get an advanced notice. Extra copies of marriage licenses and other necessary forms have already been made.

Those preparation were made in anticipation of the crush of same-sex couples expected at City Hall if the Supreme Court puts an end to Prop 8.

San Francisco Thom Watson shared with KTVU's Heather Holmes some special momentos from his commitment ceremony in 2009 with his long-time partner Jeff Tabaco.

"This is a picture that my mom had made for us," said  Watson. "We've been waiting to marry for a long time."

Watson is optimistic that his wait for a legal marriage ceremony may soon be over.

"We have to be prepared for any potentiality," said San Francisco City Attorney Dennis Herrera.

Herrera is counting on the justices to turn down a hearing on the case that would mean the lower court decision holds and same-sex marriages would resume, likely within a week.

Herrera has asked for a heads up should that happen.

"We want to be prepared, if marriages do start, to number one have staff on hand to perform marriages, because there could be crowds," said Herrera. "And number two, from a public safety perspective."

In the past, there have been large protests and long lines at city hall when gay marriage was briefly legal.

Many couples waited for hours to apply for licenses, and ceremonies went on for weeks.

"We want to be able to allow people to come in one day, get their licenses, get married and have it recorded," said San Francisco City Administrator Naomi Kelly.

The city administrator said the county clerk's office is gearing up and will bring in extra volunteers and extend hours if necessary.

"We will make sure that anyone who wants to get married that day will get married," said Kelly.

But if the Supreme Court decides to take the case, a ruling is not expected before next June.