More information on the details of the federal incentive to First-time home buyers

The program is called First-time Home Buyer Incentive first announced in March and to be implemented starting September 2, 2019. First closing to be on or after November 1, 2019. As there may still be changes keep in touch with your real estate agent to keep abreast.
Here's an excerpt from CBC news.

Government lays out fine print of new CMHC program that could contribute 10% to price of first home 

The government on Monday released details of a program  announced during the last federal budget, an initiative that could see Canada's housing agency contribute up to 10 per cent of the price of a buyer's first home if certain conditions are met.

Under the First Time Home Buyer Incentive program, which was announced in March and will officially launch in September, a first-time homebuyer who earns less than $120,000 can qualify. The Canada Mortgage and Housing Corporation would kick in up to 10 per cent of the purchase price of the home, providing the borrower can come up with the minimum amount for an insured mortgage, which is now at five per cent.

If that bar is met, the CMHC may kick in an additional five per cent of the purchase price of a resale home. For a newly built home, the CMCH may contribute up to 10 per cent.

The stakes from the CMHC would be interest free, meaning no ongoing cost to pay down, like a mortgage does. But the government says in exchange for its stake, the CMHC would get to participate "in the upside and downside of the change in the property value" — which means they would be entitled to any corresponding increase in the value of a home when the buyer eventually sells. On the flip side, the government would also on the hook for any share of the loss if the property depreciates.

On a home costing $500,000, if the borrower puts up $25,000 and the CMHC puts up the same amount, the CMHC would then own five per cent of that home. So if, down the line, the house appreciates to $600,000 and the borrower wants to sell, they would have to give the CMHC five per cent of the sale price — $30,000 in this example — not the $25,000 the CMHC put down in the first place.

While a bill would be paid down the line, the savings over the years could add up. In the example above, the program would save a would-be borrower $286 a month in mortgage costs over the life of the loan, $3,430 a year.